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Reality Theory: Geoscience&Ecology
[edit]- 12-hour clock
- 180th meridian
- 1931 China floods
- 1983–1985 famine in Ethiopia
- 24-hour clock
- Abiogenesis
- Abiotic component
- Abiotic stress
- Abrasion (geology)
- Abrupt climate change
- Abseiling
- Absolute dating
- Abundance (ecology)
- Abyssal hill
- Abyssal plain
- Acclimatization
- Acid rain
- Activated sludge
- Adaptation
- Adaptationism
- Adaptive radiation
- Aeolian landform
- Aeolian processes
- Aerated lagoon
- Aerial photography
- Aeronautical chart
- Aeroplankton
- Africa
- Afternoon
- Aftershock
- Agonistic behaviour
- Agricultural land
- Agriculture
- Agroforestry
- Air mass
- Air navigation
- Air pollution
- Airglow
- Alarm clock
- Alarm signal
- Alcohol by volume
- Alcoholic drink
- Ale
- Algaculture
- Algae
- Algal bloom
- Allee effect
- Allele frequency
- Alligator
- Alloparenting
- Allopatric speciation
- Allotment (gardening)
- Alluvial fan
- Alpha (ethology)
- Alpine climate
- Alps
- Alternatives to Darwinian evolution
- Altitude
- Altruism (biology)
- Amber
- Ambient pressure
- Ambush predator
- Americas
- Amethyst
- Amniote
- Amoeba
- Amphibian
- Anaerobic digestion
- Anchor (climbing)
- Anchovy
- Andes
- Anemometer
- Angel Falls
- Angling
- Animal
- Animal breeding
- Animal coloration
- Animal communication
- Animal feed
- Animal husbandry
- Animal identification
- Animal locomotion
- Animal migration
- Animal navigation
- Animal product
- Animal sexual behaviour
- Animal slaughter
- Animal training
- Annelid
- Annual plant
- Ant
- Ant colony
- Antarctic Circle
- Antarctic Circumpolar Current
- Antarctica
- Anti-predator adaptation
- Anticline
- Anticyclone
- Antipodes
- Apex predator
- Aphid
- Aposematism
- Apparent temperature
- Apple
- Aquaculture
- Aquaponics
- Aquarium
- Aquatic animal
- Aquatic ecosystem
- Aquatic locomotion
- Aquatic mammal
- Aquatic plant
- Aqueduct (water supply)
- Aquifer
- Arable land
- Arachnid
- Arboreal locomotion
- Archaea
- Archaeology
- Archaic humans
- Archean
- Archipelago
- Arctic Circle
- Arctic ecology
- Arctic exploration
- Arctic methane emissions
- Arctic Ocean
- Arctic oscillation
- Areca nut
- Arecaceae
- Arthropod
- Artificial island
- Asia
- Associated petroleum gas
- Assortative mating
- Asteraceae
- Astrobiology
- Atlantic meridional overturning circulation
- Atlantic Ocean
- Atmosphere
- Atmosphere of Earth
- Atmospheric carbon cycle
- Atmospheric chemistry
- Atmospheric circulation
- Atmospheric convection
- Atmospheric escape
- Atmospheric instability
- Atmospheric model
- Atmospheric pressure
- Atmospheric science
- Atmospheric sounding
- Atmospheric temperature
- Atmospheric tide
- Atomic clock
- Atterberg limits
- Aurora
- Australia (continent)
- Australopithecus
- Autocatalytic set
- Autotroph
- Autumn
- Avalanche
- Axe
- Baby food
- Background radiation
- Bacon
- Bacteria
- Bacterial phylodynamics
- Bagel
- Bait (luring substance)
- Baker's yeast
- Baking
- Baking powder
- Balance wheel
- Balancing selection
- Baldwin effect
- Bamboo
- Banana
- Banff National Park
- Barbecue
- Barley
- Barn
- Barometer
- Barrier island
- Basalt
- Bat
- Bateman's principle
- Batesian mimicry
- Bathymetry
- Batter (cooking)
- Bauxite
- Bay
- Bayesian inference in phylogeny
- Beach
- Beach evolution
- Beach nourishment
- Beacon
- Bean
- Bear
- Bearing (navigation)
- Beaufort scale
- Beaver
- Beaver dam
- Bed (geology)
- Bed bug
- Bee
- Beef
- Beehive
- Beekeeping
- Beer
- Beetle
- Behavioral ecology
- Belay device
- Belaying
- Bengal famine of 1943
- Benthic boundary layer
- Benthic zone
- Benthos
- Berry (botany)
- Beryl
- Biennial plant
- Binomial nomenclature
- Bioaccumulation
- Bioaerosol
- Biocapacity
- Biocoenosis
- Biodegradation
- Biodiversity
- Biodiversity loss
- Bioerosion
- Biofilter
- Biofouling
- Biogas
- Biogeochemical cycle
- Biogeochemistry
- Biogeographic realm
- Biogeography
- Biological dispersal
- Biological interaction
- Biological ornament
- Biological pest control
- Biological pump
- Biological rules
- Biological soil crust
- Biological specificity
- Biomass (ecology)
- Biome
- Biomineralization
- Biophysical environment
- Bioregion
- Bioremediation
- Biosequestration
- Biosignature
- Biosolids
- Biosphere
- Biosphere 2
- Biostratigraphy
- Biotic component
- Biotic stress
- Bioturbation
- Bipedalism
- Bird
- Bird colony
- Bird flight
- Bird migration
- Bird nest
- Birdcage
- Birkeland current
- Birth rate
- Biscuit
- Bit (horse)
- Black pepper
- Black Sea
- Blanching (cooking)
- Blizzard
- Block (meteorology)
- Blowhole (geology)
- Blowout (well drilling)
- Blowout preventer
- Bog
- Boiling
- Bombyx mori
- Bonobo
- Bora Bora
- Borehole
- Boring (earth)
- Botanical garden
- Botany
- Bottled oxygen (climbing)
- Boundary current
- Brackish water
- Braising
- Bread
- Bread roll
- Breadfruit
- Breakfast
- Breaking wave
- Breakwater (structure)
- Breast milk
- Brewery
- Brewing
- Bridle
- Brine
- Brining
- Brood parasite
- Broth
- Brown bread
- Brown sugar
- Browning (partial cooking)
- Browsing (herbivory)
- Bryophyte
- Built environment
- Bull
- Bungee jumping
- Buoy
- Buoyancy compensator (diving)
- Burgess Shale
- Burrow
- Butter
- Butterfly
- Cabbage
- Cake
- Calcite
- Caldera
- Calendar
- Calendar date
- Calendar era
- Calf
- Cambrian explosion
- Camel
- Camellia sinensis
- Camouflage
- Camping
- Canal
- Candy
- Cannabis
- Canning
- Canyon
- Capsicum
- Carbon capture and storage
- Carbon cycle
- Carbon dioxide in Earth's atmosphere
- Carbon fixation
- Carbon sequestration
- Carbon sink
- Carbonated water
- Cardinal direction
- Carnivore
- Carnivorous plant
- Carrot
- Carrying capacity
- Cartographic design
- Cartography
- Cascade effect (ecology)
- Cash crop
- Caspian Sea
- Cassava
- Cat
- Catch and release
- Caterpillar
- Cattle
- Cattle feeding
- Cave
- Caviar
- Celery
- Celestial navigation
- Cellular agriculture
- Center of origin
- Centers of action
- Cephalopod
- Cereal
- Cetacea
- Chaff
- Chainsaw
- Chalk
- Channel (geography)
- Character displacement
- Cheating (biology)
- Cheese
- Chemical defense
- Chemical waste
- Chemotroph
- Chert
- Chewing gum
- Chicken
- Chicken as food
- Chickpea
- Chicory
- Chili pepper
- Chimpanzee
- Chinese famine of 1942–1943
- Chip (snack type)
- Chocolate
- Chocolate bar
- Chordate
- Chronological dating
- Chronology
- Chronometry
- Chutney
- Cider
- Ciliate
- Cinnamon
- Circle of latitude
- Circumnavigation
- Cirrus cloud
- Cistern
- Citrus
- City
- Clade
- Cladistics
- Cladogram
- Clam
- Class (biology)
- Clastic rock
- Clathrate hydrate
- Clay
- Clear-air turbulence
- Clearcutting
- Cliff
- Climate
- Climate change
- Climate change feedback
- Climate change mitigation
- Climate engineering
- Climate model
- Climate sensitivity
- Climate state
- Climate system
- Climate variability and change
- Climatology
- Climbing
- Climbing harness
- Climbing protection
- Climbing shoe
- Cline (biology)
- Clock
- Clock face
- Clockwork
- Closed ecological system
- Cloud
- Cloud albedo
- Cloud base
- Cloud condensation nuclei
- Cloud cover
- Cloud feedback
- Cloud physics
- Cloud suck
- Clove
- Cnidaria
- Co-operation (evolution)
- Coagulation (water treatment)
- Coal
- Coal mining
- Coalbed methane
- Coalescent theory
- Coast
- Coastal engineering
- Coastal erosion
- Coastal flooding
- Coastal management
- Coca-Cola
- Cockroach
- Cocktail
- Cocoa bean
- Cocoa butter
- Coconut
- Cod
- Coevolution
- Coexistence theory
- Coffea
- Coffea arabica
- Coffee
- Coffee bean
- Coffee preparation
- Cold and heat adaptations in humans
- Cold front
- Cold wave
- Collar (animal)
- Collective animal behavior
- Colonisation (biology)
- Colony (biology)
- Columbian exchange
- Columbidae
- Combine harvester
- Combined sewer
- Commensalism
- Commercial fishing
- Comminution
- Common descent
- Common fig
- Communal roosting
- Community (ecology)
- Community gardening
- Companion planting
- Compass
- Compass rose
- Competition (biology)
- Competitive exclusion principle
- Completion (oil and gas wells)
- Compost
- Computational phylogenetics
- Computer recycling
- Condiment
- Confectionery
- Conservation agriculture
- Conservation biology
- Conservation officer
- Conserved sequence
- Constructed wetland
- Consumer–resource interactions
- Contamination
- Continent
- Continental climate
- Continental collision
- Continental crust
- Continental drift
- Continental margin
- Continental shelf
- Controlled burn
- Convergence zone
- Convergent boundary
- Convergent evolution
- Cooking
- Cooking oil
- Cooperative breeding
- Coordinated Universal Time
- Coppicing
- Coral
- Coral reef
- Core sample
- Core–mantle boundary
- Core–mantle differentiation
- Coriander
- Cork (material)
- Corundum
- Corvidae
- Corvus
- Cotton
- Cotton gin
- Course (navigation)
- Courtship display
- Cover crop
- Cowboy
- Crab
- Cracker (food)
- Crampons
- Crawling (human)
- Crayfish
- Cream
- Cretaceous–Paleogene extinction event
- Crevasse
- Crocodile
- Croissant
- Crop
- Crop desiccation
- Crop residue
- Crop rotation
- Crop yield
- Crosscut saw
- Crusher
- Crust (geology)
- Crustacean
- Cryolite
- Cryosphere
- Cryovolcano
- Crypsis
- Cucumber
- Cuisine
- Culling
- Cultivar
- Cultivator
- Cultured meat
- Cumin
- Cumulonimbus cloud
- Cumulus cloud
- Curd
- Curdling
- Curing (food preservation)
- Curing of tobacco
- Curry
- Custard
- Cutting (plant)
- Cyanobacteria
- Cyatheales
- Cyclogenesis
- Cyclone
- Dairy farming
- Dairy product
- Date palm
- Dawn
- Day
- Daylight saving time
- Daytime
- Dead reckoning
- Dead Sea
- Dead zone (ecology)
- Debris flow
- Decaffeination
- Deception in animals
- Deciduous
- Decomposition
- Deep frying
- Deep geological repository
- Deep sea
- Deep sea mining
- Deep-sea exploration
- Deepwater drilling
- Deer
- Defaunation
- Defensible space (fire control)
- Defoliant
- Deforestation
- Deglaciation
- Deimatic behaviour
- Demographic transition
- Demographic trap
- Demographics of the world
- Demography
- Dendrochronology
- Denitrification
- Denitrifying bacteria
- Density altitude
- Density dependence
- Density of air
- Denudation
- Deposition (geology)
- Depression (geology)
- Depth sounding
- Derecho
- Desalination
- Desert
- Desert climate
- Desertification
- Dessert
- Detritivore
- Detritus
- Dew
- Dew point
- Diagenesis
- Diamond
- Diatom
- Diatomaceous earth
- Diffuse sky radiation
- Digital clock
- Digital elevation model
- Dinner
- Dinosaur
- Directed panspermia
- Direction finding
- Directional drilling
- Directional selection
- Disassortative mating
- Discontinuity (geotechnical engineering)
- Dish (food)
- Display (zoology)
- Disruptive selection
- Distraction display
- Disturbance (ecology)
- Ditch
- Diver navigation
- Divergent boundary
- Diversification rates
- Diversity index
- Diving cylinder
- Diving equipment
- Diving mask
- Diving regulator
- Diving suit
- Dog
- Dolphin
- Domain (biology)
- Domestic duck
- Domestic turkey
- Domestication
- Domestication of animals
- Dominance (ethology)
- Dominance hierarchy
- Donkey
- Doomsday argument
- Dough
- Dough conditioner
- Doughnut
- Douglas fir
- Douglas sea scale
- Downburst
- Downwelling
- Drainage
- Drainage basin
- Drainage system (agriculture)
- Drainage system (geomorphology)
- Drake equation
- Dried fruit
- Drilling rig
- Drink
- Drink mix
- Drinking
- Drinking water
- Drought
- Droughts and famines in Russia and the Soviet Union
- Droving
- Drupe
- Dry cask storage
- Dry suit
- Dumpster
- Dune
- Dusk
- Dust
- Dust devil
- Dust storm
- Dynamic energy budget theory
- Dynamic positioning
- Eagle
- Early expansions of hominins out of Africa
- Early human migrations
- Earth science
- Earth system science
- Earth's energy budget
- Earth's magnetic field
- Earth's orbit
- Earth's rotation
- Earthquake
- Earthquake swarm
- Earthworm
- Eastern Hemisphere
- Eating
- Echinoderm
- Echo sounding
- Ecological collapse
- Ecological light pollution
- Ecological network
- Ecological niche
- Ecological pyramid
- Ecological resilience
- Ecological stability
- Ecological succession
- Ecology
- Ecoregion
- Ecosystem
- Ecosystem diversity
- Ecosystem ecology
- Ecosystem engineer
- Ecosystem model
- Ecosystem services
- Ecotone
- Ecotype
- Ectosymbiosis
- Eddy covariance
- Edible mushroom
- Edible seaweed
- Effective population size
- Effective stress
- Effusive eruption
- Egg as food
- Eggplant
- Ekman transport
- El Niño
- El Niño–Southern Oscillation
- Electronic waste
- Elephant
- Elevation
- Elevational diversity gradient
- Embryophyte
- Emerald
- Endangered species
- Endosymbiont
- Energy drink
- Energy flow (ecology)
- Engineering geology
- Environmental chemistry
- Environmental degradation
- Environmental engineering
- Environmental monitoring
- Environmental radioactivity
- Environmental remediation
- Environmental science
- Epicenter
- Epidemiological transition
- Equation of time
- Equator
- Equestrianism
- Equinox
- Erosion
- Error catastrophe
- Error threshold (evolution)
- Escapement
- Estuary
- Ethology
- Eucalyptus
- Eukaryote
- Europe
- European and American voyages of scientific exploration
- Eusociality
- Eutrophication
- Evapotranspiration
- Evening
- Evergreen
- Evidence of common descent
- Evolution
- Evolution of bacteria
- Evolution of human intelligence
- Evolution of mammals
- Evolution of sexual reproduction
- Evolution of tetrapods
- Evolutionary arms race
- Evolutionary biology
- Evolutionary developmental biology
- Evolutionary history of life
- Evolutionary landscape
- Evolutionary mismatch
- Evolutionary pressure
- Evolutionary radiation
- Evolvability
- Exaptation
- Excavation (archaeology)
- Exploration
- Explosive eruption
- Extended evolutionary synthesis
- Extensive farming
- Extinction
- Extinction debt
- Extinction event
- Extinction threshold
- Extinction vortex
- Extra-pair copulation
- Extraction of petroleum
- Extraterrestrial atmosphere
- Extraterrestrial life
- Extraterrestrial liquid water
- Extratropical cyclone
- Extreme sport
- Extreme weather
- Extremophile
- Extrusive rock
- Faboideae
- Falafel
- Falcon
- Falconry
- Family (biology)
- Famine
- Famine in India
- Famines in Ethiopia
- Farm
- Farmer
- Farmer-managed natural regeneration
- Fast food
- Fault (geology)
- Fauna
- Fecundity
- Fecundity selection
- Feldspar
- Fen
- Fermentation in food processing
- Fermentation in winemaking
- Fern
- Fertility
- Fertilizer
- Ficus
- Field (agriculture)
- Field research
- Figure of the Earth
- Fillet (cut)
- Filter feeder
- Fire ecology
- Fire making
- Fire setting
- Firebreak
- Firestorm
- First voyage of James Cook
- Fish
- Fish and chips
- Fish as food
- Fish farming
- Fish hook
- Fish migration
- Fish trap
- Fisher's fundamental theorem of natural selection
- Fisher's principle
- Fisherian runaway
- Fishery
- Fishing
- Fishing industry
- Fishing line
- Fishing lure
- Fishing net
- Fishing rod
- Fishing sinker
- Fishing tackle
- Fishing techniques
- Fissure vent
- Fitness (biology)
- Fitness-density covariance
- Fixation (population genetics)
- Fixed action pattern
- Fjord
- Flagellate
- Flail
- Flatbread
- Flax
- Flea
- Flint
- Floating production storage and offloading
- Flocking (behavior)
- Flood
- Flood control
- Floodplain
- Flora
- Floriculture
- Floristry
- Flour
- Flower
- Flower preservation
- Flowering plant
- Flowerpot
- Fluid flow through porous media
- Fluorite
- Fluvial processes
- Fly
- Fly spray
- Fly-killing device
- Flying and gliding animals
- Fodder
- Fog
- Fold (geology)
- Food
- Food chain
- Food contaminant
- Food drying
- Food irradiation
- Food packaging
- Food presentation
- Food preservation
- Food processing
- Food safety
- Food security
- Food spoilage
- Food storage
- Food waste
- Food web
- Forage
- Forage fish
- Foraging
- Force of mortality
- Foreshock
- Forest
- Forest degradation
- Forest ecology
- Forest gardening
- Forest management
- Forestry
- Formation of rocks
- Forwarder
- Fossil
- Fossils of the Burgess Shale
- Founder effect
- Fountain
- Fox
- Fractional crystallization (geology)
- Fracture (geology)
- Fracture (mineralogy)
- Free range
- Freeze-drying
- French fries
- Frequency-dependent selection
- Fresh water
- Freshwater ecosystem
- Fritter
- Frog
- Frontogenesis
- Frost
- Frost heaving
- Frozen food
- Frugivore
- Fruit
- Fruit preserves
- Frying
- Fumigation
- Fungus
- Future of Earth
- Gaia hypothesis
- Gait
- Gait (human)
- Galápagos National Park
- Game (hunting)
- Game reserve
- Gangue
- Garbage truck
- Garden
- Garden design
- Garden hose
- Garden tool
- Gardening
- Garlic
- Garnish (food)
- Gas venting
- Gelatin
- Gelatin dessert
- Gemstone
- Gene flow
- Gene pool
- Gene-centered view of evolution
- General circulation model
- Generation time
- Genetic assimilation
- Genetic distance
- Genetic divergence
- Genetic diversity
- Genetic drift
- Genetic hitchhiking
- Genetic load
- Genetic variability
- Genetic variance
- Genetic variation
- Genetically modified bacteria
- Genetically modified crops
- Genetically modified food
- Genetically modified organism
- Genus
- Geochemistry
- Geochronology
- Geodesy
- Geodetic datum
- Geographic coordinate system
- Geographic information system
- Geographical distance
- Geographical zone
- Geography
- Geolocation
- Geologic map
- Geologic time scale
- Geological formation
- Geologist
- Geology
- Geology of Mars
- Geology of solar terrestrial planets
- Geology of the Moon
- Geomagnetic reversal
- Geomagnetic storm
- Geomechanics
- Geomorphology
- Geophysical survey
- Geophysical survey (archaeology)
- Geophysics
- Geopotential
- Geostrophic current
- Geostrophic wind
- Geotechnical engineering
- Geotechnical investigation
- Geyser
- Ginger
- Glacial lake outburst flood
- Glacial period
- Glacier
- Glass recycling
- Gliding
- Global cooling
- Global dimming
- Global temperature record
- Global warming
- Global wind patterns
- Globe
- Goat
- Gold panning
- Gompertz–Makeham law of mortality
- Gorilla
- GPS navigation device
- GPS tracking unit
- Grade (slope)
- Grafting
- Grain
- Grain elevator
- Grain size
- Gram-negative bacteria
- Gram-positive bacteria
- Granary
- Grand Canyon
- Grandfather clock
- Granite
- Grape
- Grapefruit
- Grasshopper
- Grassland
- Gravel
- Gravimeter
- Gravimetry
- Gravity of Earth
- Gravity wave
- Gravy
- Grazing
- Great Barrier Reef
- Great Bengal famine of 1770
- Great Chinese Famine
- Great Famine (Ireland)
- Great Famine of 1315–1317
- Great Famine of 1876–1878
- Great Northern Expedition
- Great Oxygenation Event
- Great-circle navigation
- Green belt
- Greenhouse
- Greenhouse and icehouse Earth
- Greenhouse effect
- Greenhouse gas
- Greenhouse gas removal
- Greenwich Mean Time
- Gregorian calendar
- Grilling
- Ground meat
- Ground-penetrating radar
- Groundwater
- Groundwater pollution
- Groundwater remediation
- Group selection
- Groyne
- Guano
- Guinea pig
- Gulf
- Gulf of Mexico
- Gulf Stream
- Gully
- Gymnosperm
- Gypsum
- Gyrocompass
- Habitat
- Habitat conservation
- Habitat destruction
- Habitat fragmentation
- Hadean
- Hadley cell
- Hail
- Halter
- Ham
- Hamburger
- Hamlet (place)
- Hand-pollination
- Handicap principle
- Handline fishing
- Hang gliding
- Hard water
- Hardwood
- Hardy–Weinberg principle
- Harvest
- Harvester (forestry)
- Hashish
- Hawk
- Hay
- Hazardous waste
- Haze
- Heading (navigation)
- Headland
- Heat index
- Heat wave
- Hedge
- Hedge trimmer
- Hematite
- Hemp
- Herb
- Herbaceous plant
- Herbal tea
- Herbicide
- Herbivore
- Herd
- Herding
- Heritability
- Herring
- Heterosis
- Heterotroph
- Hevea brasiliensis
- High-altitude adaptation in humans
- High-pressure area
- Hiking
- Hiking equipment
- Hill
- Himalayas
- History of Antarctica
- History of cartography
- History of Earth
- History of human migration
- History of Oceania
- Hoe (tool)
- Holobiont
- Holocene
- Holocene extinction
- Hologenome theory of evolution
- Homebrewing
- Hominidae
- Homo
- Homo erectus
- Homo habilis
- Homo sapiens
- Homology (biology)
- Honey
- Hops
- Horizon
- Hornwort
- Horse
- Horse collar
- Horse harness
- Horse latitudes
- Horse tack
- Horseshoe
- Horticulture
- Host (biology)
- Host–parasite coevolution
- Hot chocolate
- Hot dog
- Hot spring
- Hotspot (geology)
- Hour
- Hourglass
- House sparrow
- Housefly
- Human
- Human evolution
- Human geography
- Human impact on the environment
- Human migration
- Human overpopulation
- Human population planning
- Human settlement
- Human sex ratio
- Human taxonomy
- Human uses of animals
- Human uses of living things
- Human–wildlife conflict
- Humboldt Current
- Humidity
- Hummus
- Humus
- Hunter-gatherer
- Hunting
- Hutch (animal cage)
- Hybrid (biology)
- Hybrid seed
- Hydraulic fracturing
- Hydraulic mining
- Hydrocarbon exploration
- Hydrographic survey
- Hydrography
- Hydrology
- Hydroponics
- Hydrosphere
- Hydrothermal explosion
- Hydrothermal vent
- Hypercycle (chemistry)
- Hyperspectral imaging
- Hypocenter
- Ice
- Ice age
- Ice axe
- Ice cap
- Ice core
- Ice cream
- Ice pop
- Ice rink
- Ice sheet
- Ice shelf
- Ice skate
- Ice skating
- Iceberg
- Icing (food)
- Ideal free distribution
- Igneous differentiation
- Igneous rock
- Iguazu Falls
- Impact crater
- In situ chemical oxidation
- Inbred strain
- Inbreeding
- Incineration
- Inclinometer
- Inclusive fitness
- Inclusive fitness in humans
- Indian famine of 1896–1897
- Indian famine of 1899–1900
- Indian Ocean
- Industrial agriculture
- Industrial waste
- Industrial wastewater treatment
- Inertial navigation system
- Inertial wave
- Infant food safety
- Infant formula
- Infant mortality
- Infanticide (zoology)
- Infiltration (hydrology)
- Infiltration/Inflow
- Ingredient
- Insect
- Insect flight
- Insect migration
- Insect repellent
- Insecticide
- Instant coffee
- Instant tea
- Instinct
- Instrumental temperature record
- Insular biogeography
- Integrated pest management
- Intensive animal farming
- Intensive crop farming
- Intensive farming
- Intercalation (timekeeping)
- Intercropping
- Interglacial
- Intermediate disturbance hypothesis
- Internal wave
- International Atomic Time
- International Date Line
- International Standard Atmosphere
- Interplate earthquake
- Interspecific competition
- Intertidal zone
- Intertropical Convergence Zone
- Intragenomic conflict
- Intraplate earthquake
- Intraspecific competition
- Introduced species
- Intrusive rock
- Invasive species
- Inversion (meteorology)
- Invertebrate
- Ionosphere
- Iris (plant)
- Iron ore
- Irrigation
- Irrigation sprinkler
- Island
- Island arc
- Isopoda
- Isostasy
- Isthmus
- Jade
- Japanese garden
- Jellyfish
- Jet (lignite)
- Jet stream
- Joint (geology)
- Juice
- Julian calendar
- Jumping
- Jökulhlaup
- Karst
- Kebab
- Kelp
- Kelp forest
- Kennel
- Kerogen
- Ketchup
- Keystone species
- Khat
- Kin selection
- Kingdom (biology)
- Kleiber's law
- Kneading
- Krill
- Kármán line
- Köppen climate classification
- La Niña
- Labyrinthulomycetes
- Lager
- Lagoon
- Lahar
- Lake
- Lake ecosystem
- Lake-effect snow
- Lamb and mutton
- Land
- Land bridge
- Land degradation
- Land reclamation
- Land use
- Landfill
- Landform
- Landscape
- Landscape architecture
- Landscape design
- Landscape ecology
- Landslide
- Landslide mitigation
- Landspout
- Lapis lazuli
- Lapse rate
- Lard
- Large igneous province
- Lasso
- Last universal common ancestor
- Latitude
- Latitudinal gradients in species diversity
- Lava
- Lava tube
- Law of superposition
- Lawn
- Lawn mower
- Leachate
- Leaf vegetable
- Leap year
- Leash
- Leavening agent
- Lee wave
- Legume
- Lemon
- Lemonade
- Lentil
- Leslie matrix
- Lettuce
- Levee
- Level (instrument)
- Levelling
- Lichen
- Life expectancy
- Life history theory
- Life table
- Lift (soaring)
- Lighthouse
- Lightning
- Lightning strike
- Lilium
- Limestone
- Lineage (evolution)
- Linkage disequilibrium
- Lion
- Liquor
- Liquorice
- Liquorice (confectionery)
- List of domesticated animals
- List of natural disasters by death toll
- Lithification
- Lithology
- Lithosphere
- Litter
- Livestock
- Livestock branding
- Living fossil
- Lizard
- Loaf
- Lobster
- Local extinction
- Location
- Locust
- Lodestone
- Logging
- Longitude
- Longline fishing
- Longshore drift
- Lotka–Volterra equations
- Louse
- Love wave
- Low-alcohol beer
- Low-pressure area
- Lunar calendar
- Lunar day
- Lunar month
- Lunch
- Lunch meat
- Lunisolar calendar
- Lustre (mineralogy)
- Lycopodiophyta
- Machete
- Macroecology
- Macroevolution
- Magellan's circumnavigation
- Magma
- Magnetic anomaly
- Magnetic declination
- Magnetite
- Magnetosphere
- Mahogany
- Maize
- Major explorations after the Age of Discovery
- Malt
- Malthusianism
- Malting process
- Mammal
- Mango
- Mangrove
- Mantle (geology)
- Mantle convection
- Mantle plume
- Manure
- Map
- Map projection
- Marble
- Marchantiophyta
- Margarine
- Mariana Trench
- Marination
- Marine biogeochemical cycles
- Marine biology
- Marine chronometer
- Marine ecosystem
- Marine food web
- Marine geology
- Marine habitats
- Marine life
- Marine mammal
- Marine microbiome
- Marine microorganisms
- Marine pollution
- Marine primary production
- Marine sediment
- Marine snow
- Marine weather forecasting
- Mark and recapture
- Marsh
- Mass wasting
- Mate choice
- Mating
- Mating call
- Mating system
- Matrix population models
- Mattock
- Mauna Loa
- Maximum parsimony (phylogenetics)
- Mayonnaise
- Mead
- Meadow
- Meal
- Mean radiant temperature
- Meander
- Measurement of biodiversity
- Meat
- Meat analogue
- Meatball
- Meatloaf
- Mechanical screening
- Mechanical watch
- Mechanised agriculture
- Mediterranean Sea
- Megafauna
- Megathrust earthquake
- Membrane bioreactor
- Mentha
- Mercator projection
- Meridian (geography)
- Mesocyclone
- Mesoscale convective complex
- Mesoscale meteorology
- Metabolic theory of ecology
- Metacommunity
- Metamorphic rock
- Metamorphism
- Metapopulation
- Meteorite
- Meteorological instrumentation
- Meteorologist
- Meteorology
- Methane clathrate
- Methane emissions
- Methanogen
- Micro-animal
- Microalgae
- Microbial consortium
- Microbial ecology
- Microbial mat
- Microbial population biology
- Microbiology
- Microbiome
- Microbiota
- Microburst
- Microchip implant (animal)
- Microclimate
- Microevolution
- Micrometeorite
- Microorganism
- Micropaleontology
- Microplastics
- Micropropagation
- Mid-ocean ridge
- Midnight
- Milankovitch cycles
- Mildew
- Milford Sound
- Milk
- Milk substitute
- Milking
- Milkshake
- Miller–Urey experiment
- Millet
- Mimicry
- Mincing
- Mine safety
- Miner
- Mineral
- Mineral physics
- Mineral processing
- Mineral spring
- Mineralogy
- Mineraloid
- Minimum viable population
- Mining
- Mining engineering
- Minute
- Mirage
- Mire
- Miso
- Mist
- Mixed layer
- Mobbing (animal behavior)
- Models of DNA evolution
- Modern synthesis (20th century)
- Mohs scale of mineral hardness
- Molasses
- Mold
- Molecular clock
- Molecular ecology
- Molecular evolution
- Molecular phylogenetics
- Mollusca
- Moment magnitude scale
- Monocropping
- Monoculture
- Monogamy in animals
- Monophyly
- Monsoon
- Month
- Moraine
- Morning
- Mortality rate
- Mosquito
- Mosquito control
- Mosquito net
- Moss
- Most recent common ancestor
- Moth
- Mound-building termites
- Mount Everest
- Mount Fuji
- Mountain
- Mountain formation
- Mountain range
- Mountaineering
- Mouse
- Mousetrap
- Mud
- Mudflat
- Mulch
- Multibeam echosounder
- Multicellular organism
- Multilateration
- Multispectral image
- Municipal solid waste
- Musa (genus)
- Mushroom
- Mussel
- Mustard (condiment)
- Muster (livestock)
- Mutation rate
- Mutualism (biology)
- Mycoremediation
- Mycorrhiza
- Myriapoda
- Müllerian mimicry
- Nanoremediation
- National park
- Natural disaster
- Natural environment
- Natural gas
- Natural hazard
- Natural landscape
- Natural resource
- Natural selection
- Nature
- Nature reserve
- Nautical chart
- Navigation
- Navigation system
- Neanderthal
- Nectar
- Negative selection (natural selection)
- Nematode
- Neontology
- Nest
- Nest box
- Neutral mutation
- Neutral theory of molecular evolution
- Niagara Falls
- Niche apportionment models
- Niche construction
- Niche differentiation
- Nickel–Strunz classification
- Nicotiana tabacum
- Night
- Night sky
- Nitrification
- Nitrifying bacteria
- Nitrogen cycle
- Nitrogen fixation
- Nixtamalization
- No-till farming
- Nocturnality
- Nomad
- Nomadic pastoralism
- Nomenclature codes
- Non-directional beacon
- Non-renewable resource
- Non-vascular plant
- Noodle
- Noon
- North America
- North Atlantic oscillation
- North Magnetic Pole
- North Pole
- Northeast Passage
- Northern Chinese Famine of 1876–1879
- Northern Hemisphere
- Northwest Passage
- Nuclear fallout
- Nuclear winter
- Numerical weather prediction
- Nut (food)
- Nut (fruit)
- Nutrient cycle
- Nutrition transition
- Nymphaeaceae
- Oak
- Oasis
- Observatory
- Ocean
- Ocean acidification
- Ocean chemistry
- Ocean current
- Ocean exploration
- Ocean general circulation model
- Ocean gyre
- Oceania
- Oceanic basin
- Oceanic carbon cycle
- Oceanic crust
- Oceanic trench
- Oceanography
- Octopus
- Offal
- Offshore drilling
- Offshore geotechnical engineering
- Offspring
- Oil depletion
- Oil platform
- Oil reserves
- Oil sands
- Oil shale
- Oil spill
- Oil well
- Oil well control
- Olfactory navigation
- Olive
- Olive oil
- Omnivore
- Onion
- Onsite sewage facility
- Opal
- Open pollination
- Open space reserve
- Open-field system
- Open-pit mining
- Opium
- Optimal foraging theory
- Optimality model
- Orange (fruit)
- Orangutan
- Orbital forcing
- Orchard
- Orchidaceae
- Order (biology)
- Ore
- Ore concentrate
- Organic farming
- Organic food
- Organism
- Organisms at high altitude
- Orienteering
- Ornamental plant
- Orogeny
- Outburst flood
- Outcrop
- Outcrossing
- Outdoor cooking
- Outline of food preparation
- Overconsumption
- Overexploitation
- Overfishing
- Overgrazing
- Overpopulation
- Owl
- Ox
- Oxygen cycle
- Oyster
- Ozone depletion and climate change
- Ozone layer
- P-wave
- Pacific Ocean
- Pack hunter
- Paddy field
- Pair bond
- Paleoclimatology
- Paleontology
- Panama Canal
- Pancake
- Pangaea
- Panmixia
- Panspermia
- Paper recycling
- Parachuting
- Paragliding
- Parallel evolution
- Parapatric speciation
- Paraphyly
- Parasitism
- Parasitoid
- Parental care
- Parental investment
- Park
- Park ranger
- Parrot
- Parsley
- Partial melting
- Particulate organic matter
- Particulates
- Pasta
- Pasteurization
- Pastoralism
- Pastry
- Pasture
- Patch dynamics
- Patterned ground
- Patterns in nature
- Patty
- Pea
- Peach
- Pear
- Pearl
- Peat
- Pecking order
- Pedogenesis
- Pedology
- Pedosphere
- Pelagic zone
- Pen (enclosure)
- Pendulum
- Pendulum clock
- Perennial plant
- Periglaciation
- Peripatric speciation
- Permaculture
- Permafrost
- Permafrost carbon cycle
- Permeability (earth sciences)
- Permian–Triassic extinction event
- Persian Gulf
- Persistent organic pollutant
- Pest (organism)
- Pest control
- Pesticide
- Pet
- Pet food
- Pet harness
- Petrifaction
- Petroleum
- Petroleum engineering
- Petroleum geology
- Petroleum reservoir
- Petrology
- Peyote
- Phanerozoic
- Phosphorus cycle
- Photogrammetry
- Phototroph
- Phreatic eruption
- Phreatomagmatic eruption
- Phylogenesis
- Phylogenetic network
- Phylogenetic nomenclature
- Phylogenetic tree
- Phylogenetics
- Phylum
- Physical geography
- Physical impacts of climate change
- Phytoplankton
- Phytoremediation
- Pickaxe
- Pickling
- Picnic
- Pie
- Pig
- Piloting
- Pine
- Pineapple
- Pingo
- Pinniped
- Pinophyta
- Pioneer species
- Piperaceae
- Pita
- Pitch (sports field)
- Pitchfork
- Pizza
- Placer deposit
- Placer mining
- Plain
- Planetary boundaries
- Planetary boundary layer
- Planetary core
- Planetary differentiation
- Planetary geology
- Planetary science
- Planetary surface
- Plankton
- Plant
- Plant breeding
- Plant ecology
- Plant litter
- Plant microbiome
- Plant milk
- Plant nursery
- Plant propagation
- Plant tissue culture
- Plantation
- Plants in space
- Plastic pollution
- Plastic recycling
- Plate tectonics
- Plateau
- Pleistocene
- Plesiomorphy and symplesiomorphy
- Plough
- Poaceae
- Poaching (cooking)
- Point of interest
- Points of the compass
- Polar amplification
- Polar circle
- Polar climate
- Polar exploration
- Polar High
- Polar ice cap
- Polar motion
- Polar regions of Earth
- Polar vortex
- Pollarding
- Pollen
- Pollenizer
- Pollination
- Pollinator
- Pollutant
- Pollution
- Polyculture
- Polygynandry
- Polygyny in animals
- Polygyny threshold model
- Polymorphism (biology)
- Polyp (zoology)
- Polyphyly
- Polytunnel
- Pomegranate
- Pond
- Popcorn
- Poppy
- Population
- Population ageing
- Population bottleneck
- Population control
- Population decline
- Population density
- Population dynamics
- Population ecology
- Population genetics
- Population growth
- Population pyramid
- Population size
- Population stratification
- Population structure (genetics)
- Pore water pressure
- Pork
- Porosity
- Porous medium
- Porridge
- Portuguese discoveries
- Position fixing
- Position resection
- Positioning system
- Post-glacial rebound
- Potato
- Potato chip
- Potential temperature
- Potential vorticity
- Pottage
- Poultry
- Poultry farming
- Powdered milk
- Pre-modern human migration
- Precipitation
- Precision agriculture
- Predation
- Preservative
- Pressure cooking
- Pressure gradient
- Pressure system
- Pressure-gradient force
- Prevailing winds
- Price equation
- Primal cut
- Primary production
- Primary succession
- Primate
- Prime meridian
- Primitive (phylogenetics)
- Primitive equations
- Primordial soup
- Principle of faunal succession
- Productivity (ecology)
- Professional hunter
- Proglacial lake
- Prokaryote
- Prospecting
- Protected area
- Proterozoic
- Protist
- Protozoa
- Proxy (climate)
- Pruning
- Pruning shears
- Psilocybin mushroom
- Psychoactive plant
- Psychrometrics
- Puddle
- Pumice
- Pumping station
- Pumpjack
- Punctuated equilibrium
- Purified water
- Pursuit predation
- Pyroclastic flow
- Quadrupedalism
- Quantitative genetics
- Quarry
- Quartz
- Quartz clock
- Quaternary
- Quick bread
- Quicksand
- R/K selection theory
- Rabbit
- Radar navigation
- Radiative forcing
- Radio beacon
- Radio clock
- Radio direction finder
- Radio navigation
- Radioactive contamination
- Radioactive waste
- Radiocarbon dating
- Radiometric dating
- Radiosonde
- Rafting
- Rain
- Rainbow
- Rainforest
- Raisin
- Rake (tool)
- Ramen
- Ranch
- Rat
- Rate of evolution
- Raw milk
- Raw water
- Reaper
- Rebreather
- Recent African origin of modern humans
- Recipe
- Reciprocal altruism
- Reciprocity (evolution)
- Reclaimed water
- Recreational fishing
- Recycling
- Red Queen hypothesis
- Red Sea
- Reef
- Refined grains
- Reforestation
- Refuge (ecology)
- Regenerative agriculture
- Regime shift
- Region
- Regolith
- Rein
- Relative dating
- Relative direction
- Relative humidity
- Relative nonlinearity
- Relative species abundance
- Relish
- Remediation of contaminated sites with cement
- Remineralisation
- Remote sensing
- Remote sensing (geology)
- Renewable resource
- Reproductive isolation
- Reproductive success
- Reptile
- Research station
- Reservoir
- Resource
- Resource depletion
- Resource recovery
- Restoration ecology
- Reuse
- Reuse of excreta
- Rewilding (conservation biology)
- Rhumb line
- Rice
- Richter magnitude scale
- Ridge
- Ridge (meteorology)
- Ridge lift
- Ridge push
- Rift
- Rift valley
- Ring of Fire
- Rip current
- Riparian zone
- Ripening
- River
- River delta
- River ecosystem
- RNA world
- Roasting
- Robustness (evolution)
- Rock (geology)
- Rock cycle
- Rock magnetism
- Rock mechanics
- Rock microstructure
- Rock-climbing equipment
- Rodent
- Roe
- Rogue wave
- Roller skates
- Roller skating
- Rose
- Rossby wave
- Rotating biological contactor
- Rotifer
- Routine flaring
- Rubber tapping
- Ruby
- Rum
- Runaway greenhouse effect
- Running
- Rural area
- Russian famine of 1601–1603
- Russian famine of 1921–22
- S-wave
- Saddle
- Safari park
- Sake
- Salad
- Saline water
- Salinity
- Salmon
- Salt
- Salt dome
- Salt marsh
- Saltation (biology)
- Sand
- Sandstone
- Sandwich
- Sanitary sewer
- Sanitary sewer overflow
- Sanitation
- Sapphire
- Saprotrophic nutrition
- Sardine
- Satellite navigation
- Sauce
- Sausage
- Savanna
- Saw
- Scale (map)
- Scallop
- Scavenger
- Scree
- Scuba diving
- Scuba set
- Scythe
- Sea
- Sea breeze
- Sea ice
- Sea level
- Sea level rise
- Sea salt aerosol
- Sea spray
- Sea state
- Sea surface temperature
- Sea urchin
- Seabed
- Seabird
- Seafloor spreading
- Seafood
- Seagrass
- Seamount
- Seashell
- Season
- Seasoning
- Seawall
- Seawater
- Seaweed
- Second voyage of HMS Beagle
- Second voyage of James Cook
- Secondary succession
- Sediment
- Sediment transport
- Sedimentary basin
- Sedimentary rock
- Sedimentation (water treatment)
- Seed
- Seed dispersal
- Seed drill
- Seed predation
- Seedling
- Seismic moment
- Seismic wave
- Seismogram
- Seismology
- Seismometer
- Selection coefficient
- Selective breeding
- Selective sweep
- Self-pollination
- Semi-arid climate
- Septic drain field
- Septic tank
- Sequence homology
- Sericulture
- Sesame
- Settlement of the Americas
- Settling
- Severe weather
- Sewage
- Sewage farm
- Sewage sludge
- Sewage sludge treatment
- Sewage treatment
- Sex ratio
- Sextant
- Sexual conflict
- Sexual selection
- Shaft mining
- Shale
- Shale gas
- Shark
- Shear strength (soil)
- Sheep
- Sheep farming
- Sheep shearing
- Shellfish
- Shelterwood cutting
- Shield volcano
- Shoal
- Shoaling and schooling
- Shore
- Shortening
- Shrimp
- Shrub
- Shrubland
- Sickle
- Sidereal time
- Sidereal year
- Signalling theory
- Significant wave height
- Silicate minerals
- Silo
- Silt
- Silviculture
- Simmering
- Sinkhole
- Sinking cities
- Skateboard
- Skateboarding
- Ski
- Skidder
- Skiing
- Sky
- Sky brightness
- Slab (geology)
- Slab pull
- Slab suction
- Slash-and-burn
- Slaughterhouse
- Sliced bread
- Slime mold
- Sluice
- Smallholding
- Smog
- Smoking (cooking)
- Smoothie
- Snack
- Snail
- Snake
- Snorkel (swimming)
- Snorkeling
- Snow
- Snowboard
- Snowboarding
- Snowflake
- Snowshoe
- Sociality
- Sociobiology
- Soft drink
- Soft water
- Softwood
- Soil
- Soil acidification
- Soil biology
- Soil conditioner
- Soil conservation
- Soil contamination
- Soil erosion
- Soil fertility
- Soil horizon
- Soil liquefaction
- Soil mechanics
- Soil organic matter
- Soil retrogression and degradation
- Soil salinity
- Soil science
- Soil structure
- Soil texture
- Soil vapor extraction
- Soil water (retention)
- Solar calendar
- Solar irradiance
- Solar radiation management
- Solar time
- Solstice
- Soup
- Source–sink dynamics
- Sourdough
- South America
- South China Sea
- South Magnetic Pole
- South Pole
- Southern Hemisphere
- Southern Ocean
- Soviet famine of 1932–33
- Soviet famine of 1946–47
- Sowing
- Soy milk
- Soy sauce
- Soybean
- Space food
- Spaghetti
- Spandrel (biology)
- Spatial analysis
- Spatial ecology
- Spearfishing
- Speciation
- Species
- Species distribution
- Species distribution modelling
- Species diversity
- Species evenness
- Species richness
- Species sorting
- Species–area relationship
- Spectral imaging
- Sperm competition
- Spermatophyte
- Spice
- Spider
- Spider silk
- Spider web
- Spinach
- Spit (landform)
- Sponge
- Spray drying
- Sprayer
- Spread (food)
- Spring (hydrology)
- Spring (season)
- Sprite (lightning)
- Spruce
- Squall line
- Squash (drink)
- Squid
- St. Elmo's fire
- Stabilizing selection
- Stable
- Standard penetration test
- Staple food
- Starfish
- Station model
- Steak
- Steaming
- Stereoplotter
- Stew
- Stir frying
- Stirrup
- Stock (food)
- Stoping
- Storage effect
- Storm
- Storm drain
- Storm surge
- Stormwater
- Strait
- Stratification (vegetation)
- Stratification (water)
- Stratigraphy
- Stratigraphy (archaeology)
- Stratosphere
- Stratospheric aerosol injection
- Stratospheric sulfur aerosols
- Stratovolcano
- Stratum
- Stratus cloud
- Straw
- Strawberry
- Streak (mineralogy)
- Stream
- Streamflow
- Street food
- Strike and dip
- Stromatolite
- Structural geology
- Structuralism (biology)
- Structure of the Earth
- Structures built by animals
- Subduction
- Subglacial lake
- Submarine canyon
- Submarine pipeline
- Submarine volcano
- Subsidence
- Subsidence (atmosphere)
- Subsistence agriculture
- Substitution model
- Subterranea (geography)
- Subterranean fauna
- Subterranean river
- Subtropics
- Suez Canal
- Sugar
- Sugar beet
- Sugar substitute
- Sugarcane
- Sulfur cycle
- Summer
- Sun compass in animals
- Sun path
- Sundial
- Sunlight
- Sunrise
- Sunset
- Supercell
- Supercontinent
- Supercontinent cycle
- Superorganism
- Supervolcano
- Surface layer
- Surface mining
- Surface runoff
- Surface water
- Surface weather analysis
- Surface weather observation
- Surfboard
- Surfing
- Survey (archaeology)
- Surveying
- Survival kit
- Survival skills
- Sushi
- Sustainability
- Sustainable agriculture
- Swamp
- Swarm behaviour
- Sweet potato
- Swell (ocean)
- Swimfin
- Swimming
- Symbiogenesis
- Symbiosis
- Sympatric speciation
- Synapomorphy and apomorphy
- Synodic day
- Synoptic scale meteorology
- Syrup
- Systems ecology
- Taco
- Taiga
- Tailings
- Talc
- Tardigrade
- Taro
- Taxidermy
- Taxon
- Taxonomic rank
- Taxonomy (biology)
- Taylor's law
- Tea
- Teak
- Tectonic uplift
- Temperate climate
- Temperate grasslands, savannas, and shrublands
- Temperature gradient
- Tephra
- Terminator (solar)
- Termite
- Terraforming
- Terraforming of Mars
- Terrain
- Terrain cartography
- Terrestrial biological carbon cycle
- Terrestrial locomotion
- Terrestrial Time
- Territory (animal)
- Tetrapod
- Thematic map
- Theobroma cacao
- Theodolite
- Theoretical ecology
- Theory of tides
- Thermal
- Thermal comfort
- Thermal wind
- Thermohaline circulation
- Thermometer
- Thinning
- Third voyage of James Cook
- Tholin
- Threshing
- Threshing machine
- Thunder
- Thunderstorm
- Tidal marsh
- Tide
- Tide pool
- Tiger
- Tillage
- Time standard
- Time zone
- Timer
- Tinbergen's four questions
- Tinder
- Tipping points in the climate system
- Toast
- Tobacco
- Tofu
- Tomato
- Tool use by animals
- Topiary
- Topographic map
- Topography
- Topsoil
- Tornado
- Tornadogenesis
- Tortoise
- Total dissolved solids
- Total fertility rate
- Total station
- Town
- Trace fossil
- Tractor
- Trade winds
- Transform fault
- Transhumance
- Transplanting
- Trapping
- Trawling
- Tree
- Tree of life (biology)
- Tree planting
- Trekking pole
- Trench
- Triangulation (surveying)
- Trickling filter
- Tripod (surveying)
- Trolling (fishing)
- Trophic cascade
- Trophic level
- Tropic of Cancer
- Tropic of Capricorn
- Tropical climate
- Tropical cyclone
- Tropical rainforest
- Tropical year
- Tropics
- Troposphere
- Trough (meteorology)
- Trout
- True range multilateration
- Tsunami
- Tumbleweed
- Tuna
- Tundra
- Tunicate
- Turbidity
- Turnip
- Twilight
- Type (biology)
- Types of volcanic eruptions
- Ultraviolet index
- Uluru
- Unconformity
- Unconventional oil
- Underground mining (hard rock)
- Underground mining (soft rock)
- Undersea mountain range
- Undertow (water waves)
- Underwater breathing apparatus
- Underwater diving
- Ungulate
- Unicellular organism
- Unified neutral theory of biodiversity
- Uniformitarianism
- Universal Time
- Unleavened bread
- Upper-atmospheric lightning
- Upwelling
- Urban area
- Valley
- Vanilla
- Vascular plant
- Veal
- Vegetable
- Vegetable oil
- Vegetarian cuisine
- Vegetation
- Veggie burger
- Vein (geology)
- Vermin
- Vertebrate
- Vertical draft
- VHF omnidirectional range
- Vicia faba
- Victoria Falls
- Village
- Vine
- Vineyard
- Viral evolution
- Viral phylodynamics
- Visibility
- Viticulture
- Vivarium
- Vodka
- Volatiles
- Volcanic arc
- Volcanic ash
- Volcanic belt
- Volcanic cone
- Volcanic Explosivity Index
- Volcanic gas
- Volcanic rock
- Volcanic winter
- Volcanism
- Volcano
- Voyages of Christopher Columbus
- Waffle
- Walker circulation
- Walking
- Warm front
- Warren
- Wasp
- Waste
- Waste collection
- Waste container
- Waste hierarchy
- Waste management
- Waste minimisation
- Waste stabilization pond
- Waste-to-energy
- Wastewater
- Wastewater quality indicators
- Wastewater treatment
- Watch
- Water
- Water chlorination
- Water clock
- Water column
- Water conservation
- Water content
- Water cycle
- Water distribution system
- Water extraction
- Water filter
- Water pollution
- Water purification
- Water quality
- Water resource management
- Water resources
- Water scarcity
- Water softening
- Water storage
- Water supply
- Water supply network
- Water table
- Water tank
- Water tower
- Water treatment
- Water vapor
- Water well
- Waterfall
- Watermelon
- Waterspout
- Waterway
- Waypoint
- Weather
- Weather balloon
- Weather buoy
- Weather forecasting
- Weather front
- Weather map
- Weather modification
- Weather radar
- Weather station
- Weathering
- Weed
- Weed control
- Week
- Well control
- Well drilling
- Well logging
- Wellhead
- Westerlies
- Western Hemisphere
- Wet-bulb globe temperature
- Wetland
- Wetland methane emissions
- Wetsuit
- Whale
- Wheat
- Whip
- Whirlpool
- Whirlwind
- Whisky
- White bread
- White sugar
- Whiteout (weather)
- Whole grain
- Wild fisheries
- Wilderness
- Wildfire
- Wildfire suppression
- Wildland–urban interface
- Wildlife
- Wildlife conservation
- Wildlife corridor
- Wildlife management
- Wind
- Wind chill
- Wind direction
- Wind generated current
- Wind gradient
- Wind shear
- Wind speed
- Wind stress
- Wind wave
- Wind wave model
- Windsurfing
- Wine
- Winemaking
- Wingsuit flying
- Winnowing
- Winter
- Winter storm
- Wolf
- Wood
- Wood preservation
- Wood-decay fungus
- Woodchipper
- Woodland
- Woody plant
- Working animal
- World energy resources
- World Ocean
- World population
- Year
- Yeast
- Yellowstone National Park
- Yogurt
- Yosemite National Park
- Zonal and meridional flow
- Zoo
- Zoology
- Zooplankton