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- U-shaped valleyValleys formed by glacial scouring
- U.S. Climate Action PartnershipCooperative group of organisations with the aim of reducing greenhouse gas emissions
- Udall, KansasUdall is a city in Cowley County, Kansas, United States. As of the 2020 census, the popula
- Uinkaret volcanic fieldThe Uinkaret volcanic field is an area of monogenetic volcanoes in northwestern Arizona, U
- UlexiteMineral (hydrated sodium calcium borate hydroxide)
- Ultramafic rockType of igneous and meta-igneous rock
- UmberEarth pigment
- Uncompahgre PlateauThe Uncompahgre Plateau in western Colorado is a distinctive large uplift part of the Colo
- UnconformityRock surface indicating a gap in the geological record
- Unconventional (oil and gas) reservoirType of hydrocarbon reservoir
- Underground lakeLake under the Earth's surface
- Undersea mountain rangeUndersea mountain ranges are mountain ranges that are mostly or entirely underwater, and s
- UNESCO Global GeoparksGeoparks certified by the UNESCO Global Geoparks Council
- UniformitarianismAssumption that natural laws are constant through time and space
- Uninhabited islandIsland without human residents
- Union of Concerned ScientistsU.S.-based nonprofit organization
- United Nations Climate Change ConferenceAnnual climate change conferences
- United Nations Conference on the Human EnvironmentUN conference held at Stockholm in 1972
- United Nations Framework Convention on Climate ChangeInternational environmental treaty
- United Nations Ocean ConferenceSeries of international summits
- United Nations REDD ProgrammeUnited Nations programme supporting REDD+
- United States and the Paris AgreementUnited States and climate change treaty
- United States Climate AllianceOrganization in the US
- United States Geological SurveyScientific agency of the US government
- United States Lake SurveyThe United States Lake Survey (USLS) was a hydrographic survey for the Great Lakes, New Yo
- United States tropical cyclone rainfall climatologyTypically, five tropical cyclones and their extratropical cyclone remnants impact the Unit
- United States vehicle emission standardsVehicle emission regulations
- Universal Transverse Mercator coordinate systemMap projection system
- UnteraargletscherThe Unteraargletscher (German: ), literally "Lower Aare-Glacier", is the larger of the two
- Upland and lowlandTypes of plain
- Upper mantleVery thick layer of rock inside Earth
- Upper Midwest forest–savanna transitionThe Upper Midwest forest–savanna transition is a terrestrial ecoregion that is defined by
- UpwellingOceanographic phenomenon of wind-driven motion of ocean water
- Ur (continent)Hypothetical Archaean supercontinent from about 3.1 billion years ago
- Uralite Halt railway stationUralite Halt (TQ 702 737 51°26′12″N 0°26′59″E / 51.436637°N 0.449723°E) was a halt between
- UraniniteUranium-rich oxide mineral
- Uranium–lead datingType of radiometric dating
- Urban climatologyScientific study of atmosphere and the urban environment
- Urban floodingType of flood event in cities
- Urban forest inequityInequitable distribution of trees
- Urban forestryCare of trees in urban environments
- Urban reforestationPlanting of trees in urban environments
- Urban resilienceAbility of a city to function after a crisis
- UrgendaDutch nonprofit environmental foundation
- Urgenda Foundation v State of the NetherlandsDutch court case about carbon dioxide emissions
- USDA soil taxonomyClassification of soil types
- Used goodItem that is not new being sold or transferred
- Utica ShaleThe Utica Shale is a stratigraphical unit of Upper Ordovician age in the Appalachian Basin
- Utility submeterUtility sub-metering is a system that allows a landlord, property management firm, condomi
