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- LaboeLaboe (German pronunciation: ) is a municipality in the district of Plön, in Schleswig-Hol
- Labor DayFederal holiday in the United States
- LabradorMainland portion of Newfoundland and Labrador
- LabradoritePlagioclase feldspar with 50–70% anorthite
- LaccolithMass of igneous rock formed from magma
- Lachlan Fold BeltGeological feature in Australia
- Lacustrine plainLakes filled by sediment
- LadinianAge in the Middle Triassic
- LaDonna Brave Bull AllardLaDonna Brave Bull Allard (June 8, 1956 – April 10, 2021), known as Tamakawastewin ("Good
- LagerstätteSedimentary deposit with well-preserved extraordinary fossils
- LagoonShallow body of water separated from a larger one by a narrow landform
- LaharVolcanic mudslide
- Lake AlgonquinFormer lake in North America
- Lake ecosystemType of ecosystem
- Lake islandIsland located in a lake
- Lake PeigneurLake in Iberia Parish, Louisiana, US
- Lake RukwaLake Rukwa is an endorheic lake located the Rukwa Valley of Rukwa Region, Songwe Region an
- Lake StanleyLake Stanley, also called the Stanley unconformity, is a postglacial freshwater lake that
- Lake stratificationSeparation of water in a lake into distinct layers
- Lake-effect snowWeather phenomenon
- Lamb wavesLamb waves propagate in solid plates or spheres. They are elastic waves whose particle mot
- Lamination (geology)Thin layers present in sedimentary rock
- Lamont–Doherty Earth ObservatoryScientific observatory in the United States
- LamproiteMantle rock expulsed to the surface in volcanic pipes
- Land coverPhysical material covering the surface of Earth
- Land defenderType of activist
- Land developmentLandscape alteration
- Land reclamationCreating new land from oceans, seas, riverbeds or lakes
- Land surface effects on climateLand surface effects on climate are wide-ranging and vary by region. Deforestation and exp
- Land useClassification of land resources based on what can be built and on its use
- Land use, land-use change, and forestryGreenhouse gas inventory sector
- Landfill gas utilizationMethod of producing electricity
- LandformFeature of the solid surface of a planetary body
- LandmassLarge area of land
- LandscapeVisible features of a land area
- LandslideNatural hazard involving ground movement
- Landslide classificationClassification systems for mass movement of rock and regolith
- Landslide mitigationModifications to slopes to reduce the effect of landslides
- LandspoutType of tornado not originating from a mesocyclone
- LanghianThird age of the Miocene epoch
- LapilliLapilli (sg.: lapillus) is a size classification of tephra, which is material that falls o
- Lapis lazuliMetamorphic rock containing lazurite, prized for its intense blue color
- Lapis Lazuli (Fabergé egg)The Lapis Lazuli egg is a jewelled Fabergé egg, attributed to the House of Fabergé in St.
- Lapse rateVertical rate of change of temperature in atmosphere
- Laramide orogenyPeriod of mountain building in North America
- Large igneous provinceHuge regional accumulation of igneous rocks
- Large low-shear-velocity provincesStructures of the Earth's mantle
- Largetooth sawfishSpecies of cartilaginous fish
- Laser-induced breakdown spectroscopyLaser-induced breakdown spectroscopy (LIBS) is a type of atomic emission spectroscopy whic
- Last Glacial MaximumCirca 24,000–16,000 BCE; most recent era when ice sheets were at their greatest extent
- Last Glacial PeriodPeriod of major glaciations of the Northern Hemisphere (115,000–11,700 years ago)
- Last InterglacialInterglacial period which began 130,000 years ago
- Late Cenozoic Ice AgeIce age of the last 34 million years, in particular in Antarctica
- Late Devonian mass extinctionSecond of the big five mass extinctions
- Late Heavy BombardmentHypothesized astronomical event
- Late JurassicThird epoch of the Jurassic Period
- Late Ordovician mass extinctionMass extinction event c. 444 million years ago
- Late Paleozoic icehouseIce age
- Late PleistoceneThird division (unofficial) of the Pleistocene Epoch
- Late Pleistocene extinctionsExtinction of large animals at the end of the last Ice Age
- LateriteProduct of rock weathering in wet tropical climates rich in iron and aluminium
- Lau eventRelatively minor mass extinction during the Silurian period
- LaurasiaNorthern landmass that formed part of the Pangaea supercontinent
- Laurence L. SlossLaurence L. Sloss (August 26, 1913 – November 2, 1996) was an American geologist. He taugh
- LaurentiaCraton forming the geological core of North America
- Laurentian UplandThe Laurentian Upland (or Laurentian Highlands) is a physiographic region which, when refe
- Laurentide ice sheetContinental glacier in North America during the last ice age
- LavaMolten rock expelled by a volcano during an eruption
- Lava Creek TuffThe Lava Creek Tuff is a voluminous sheet of ash-flow tuff located in Wyoming, Montana and
- Lava domeRoughly circular protrusion from slowly extruded viscous volcanic lava
- Lava fieldLarge, mostly flat area of lava flows
- Lava planetA lava planet is a type of terrestrial planet, with a surface mostly or entirely covered b
- Lava tubeNatural conduit through which lava flows beneath the solid surface
- Law of included fragmentsThe law of included fragments is a method of relative dating in geology. Essentially, this
- Law of superpositionLaw stating that newer strata stack above older ones
- Law of the European UnionEuropean Union law is a system of supranational laws operating within the 27 member states
- LawmakingLawmaking is the process of crafting legislation. In its purest sense, it is the basis of
- Lawrence MorleyCanadian geophysicist (1920–2013)
- LawsoniteLawsonite is a hydrous calcium aluminium sorosilicate mineral with formula CaAl2Si2O7(OH)2
- Layered intrusionLarge sill-like body of igneous rock
- Lazarus taxonTaxon that disappears from the fossil record, only to reappear later
- LazulitePhosphate mineral
- LazuriteAlumino-silicate mineral whose blue colour is due to a sulfide species and not copper
- Leaching (pedology)Water removing soluble material from soil
- Lead cycleThe lead cycle is the biogeochemical cycle of lead through the atmosphere, lithosphere, bi
- Leaf protein concentrateEdible substance extracted from leaves
- Lebanon ValleyThe Lebanon Valley is a geographic region that lies between South Mountain and the Ridge a
- Leeuwin CurrentThe Leeuwin Current is a warm ocean current which flows southwards near the western coast
- Legacy sedimentSediment
- Legal Act of the European UnionLegal Acts of the European Union are laws which are adopted by the Institutions of the Eur
- Lehmann discontinuityGeologic boundary
- Leon County, Florida paleontological sitesThe Leon County paleontological sites are assemblages of Early Miocene invertebrates and v
- Leonardo Nemer Caldeira BrantLeonardo Nemer Caldeira Brant (born 15 July 1966) is a Brazilian jurist and International
- LepidolitePhyllosilicate mineral series in the trioctahedral mica group
- Lesley Ann HughesLesley Ann Hughes is an Australian academic and climate scientist. Hughes is Distinguished
- Lesser Himalayan StrataMajor depositional strata in the Himalaya
- Leucite HillsVolcanic field in Wyoming, United States
- Levee breachSituation where a levee containing water is breached
- Lewisian complexMetamorphic rocks in northwestern Scotland
- LherzoliteType of igneous rock
- Li SiguangLi Siguang (Chinese: 李四光; pinyin: Lǐ Sìguāng; Wade–Giles: Li Ssu-kuang; 26 October 1889 –
- Libyan SeaPortion of the Mediterranean Sea north of the African coast of ancient Libya
- LichenometryGeomorphic method of geochronologic aging
- Lichens and nitrogen cyclingSome types of lichen are able to fix nitrogen from the atmosphere. This process relies on
- Lid tectonicsAspect of planetary geology
- Liette VasseurCanadian biologist
- Life-cycle greenhouse gas emissions of energy sourcesCalculations of the global-warming potential of energy sources
- Light pillarReflections of a light source created by ice crystals in the air
- LightfastnessLightfastness is a property of a colourant such as dye or pigment that describes its resis
- LightningWeather phenomenon involving electrostatic discharge
- Lightning strikeElectric discharge between the atmosphere and the ground
- Limburg-WeilburgLimburg-Weilburg is a Kreis (district) in the west of Hesse, Germany. Neighboring district
- LimestoneType of sedimentary rock
- Limestone pavementNatural karst landform consisting of a flat, incised surface of exposed limestone
- Limits of Oceans and SeasPublication by the International Hydrographic Organization
- Limnic eruptionType of natural disaster
- LimnologyScience of inland aquatic ecosystems
- LimoniteHydrated iron oxide mineral
- Line 3 pipelineEnbridge Canadian-American oil pipeline
- Line echo wave patternA line echo wave pattern (LEWP) is a weather radar formation in which a single line of thu
- Line groupA line group is a mathematical way of describing symmetries associated with moving along a
- Lineation (geology)Lineations in structural geology are linear structural features within rocks. There are se
- Lipid pumpThe lipid pump sequesters carbon from the ocean's surface to deeper waters via lipids asso
- LiquefactionProcess that generates a liquid from a solid or a gas
- Liquiñe-Ofqui FaultMajor geological fault in Northern Chile
- Liquor licenseA liquor license (or liquor licence in most forms of Commonwealth English) is a government
- Lithium cycleThe lithium cycle (Li) is the biogeochemical cycle of lithium through the lithosphere and
- LithologyDescription of the physical characteristics of a rock unit
- LithophagaLithophaga, the date mussels, are a genus of medium-sized marine bivalve molluscs in the f
- LithosphereOutermost shell of a terrestrial-type planet or natural satellite
- Lithosphere–asthenosphere boundaryLevel representing a mechanical difference between layers in Earth's inner structure
- LithostratigraphySub-discipline of stratigraphy
- Little InaguaLittle Inagua is a small remote island in the Bahamas. It is the largest uninhabited islan
- Littoral zonePart of a sea, lake, or river that is close to the shore
- Liz MacDonaldAmerican space weather scientist
- LL chondriteThe LL chondrites are a group of stony meteorites, the least abundant group of the ordinar
- LlaimaThe Llaima Volcano is one of the largest and most active volcanoes in Chile. It is situate
- Llandovery EpochFirst Series of the Silurian
- LlaniteLlanite is a porphyritic rhyolite with distinctive phenocrysts of blue quartz (a rare quar
- Llano UpliftGeologic dome in Texas, United States
- Lloyd's Steamboat DirectoryLloyd's Steamboat Directory, and Disasters on the Western Waters is a book published in 18
- LoamSoil composed of similar proportions of sand and silt, and somewhat less clay
- Locally unwanted land useHigh-externality areas
- Loch EribollLoch Eriboll (Scottish Gaelic: "Loch Euraboil") is a 16 km (9.9 mi) long sea loch on the n
- Loch Ness SupergroupThe Loch Ness Supergroup is one of the subdivisions of the Neoproterozoic sequence of sedi
- LodePart of a rock body that holds ore
- LodraniteType of meteorites
- LoellingiteIron arsenide mineral
- LoessSediment of accumulated wind-blown dust
- Log jamA log jam is a naturally occurring phenomenon characterized by a dense accumulation of tre
- Logan FormationThe Logan Formation is the name given to a Lower Carboniferous (early Osagean) siltstone,
- Logan PassLogan Pass (elevation 6,646 ft (2,026 m)) is located along the Continental Divide in Glaci
- Logarithmic spiralSelf-similar growth curve
- Loire ValleyArea of France
- Lois Jones (scientist)American geochemist
- Lomonosov RidgeUnderwater ridge of continental crust in the Arctic Ocean
- LonarTown in Maharashtra, India
- Lonar LakeCrater Lake in Maharashtra, India
- London BasinBasin of river Thames in London
- London low emission zoneThe London Low Emission Zone (LEZ) is an area of London in which an emissions standard bas
- Lone Star, KansasLone Star is an unincorporated community in Douglas County, Kansas, United States. It is l
- Long KeyLong Key is an island in the middle Florida Keys. Long Key was called Cayo Víbora (Rattles
- Long Valley CalderaLandform near Mammoth Mountain, California, USA
- Longmen MountainsThe Longmen Mountains (simplified Chinese: 龙门山; traditional Chinese: 龍門山; pinyin: Lóngmén
- Longmenshan FaultSeismic fault in China
- Longshore driftSediment moved by the longshore current
- LonquimayLonquimay is a town and commune in the Malleco Province of southern Chile's Araucanía Regi
- López de Bertodano FormationGeologic formation in Antarctica
- LoRaWireless communication technology
- Lord Howe RiseDeep sea plateau, west of New Zealand
- LoreleiRock formation in Germany
- Los Angeles BasinSedimentary basin located along the coast of southern California
- Los Angeles City Oil FieldThe Los Angeles City Oil Field is a large oil field north of Downtown Los Angeles. Long an
- Los Angeles Times Book Prize for Science and TechnologyThe Los Angeles Times Book Prize for Science and Technology, established in 1980, is a cat
- Los Rastros FormationThe Los Rastros Formation is a mid-Carnian fossiliferous formation of the Agua de la Peña
- Loss and damage (climate change)Concept to address adverse effects of climate change
- Loss and Damage FundUN climate finance mechanism
- Lost City Hydrothermal FieldHydrothermal field in the mid-Atlantic Ocean
- Lost landsIslands or continents supposedly existing during prehistory, having since disappeared
- Lotus chaliceArtifact found in the tomb of Tutankhamun
- Louisiana ManeuversThe Louisiana Maneuvers were a series of major U.S. Army exercises held from August to Sep
- Love waveHorizontally polarized surface waves
- Low-carbon dietDiet to reduce greenhouse gas emissions
- Low-carbon economyClimate-friendly economy
- Low-carbon fuel standardRule to reduce carbon intensity of transportation fuels
- Low-emission zoneArea established to improve air quality
- Low-energy houseHouse designed for reduced energy use
- Low-pressure areaArea with air pressures lower than adjacent areas
- Low-velocity zoneSeismic zone (geology)
- Lower mantleRegion from 660 to 2900 km below Earth's surface
- Lower oceanic crustThe lower oceanic crust is the lower part of the oceanic crust and represents the major pa
- Lufilian Arc11°40′00″S 27°28′00″E / 11.666667°S 27.466667°E
- Luisa NeubauerGerman climate activist
- Luna LeopoldGeomorphologist and hydrologist
- LupercalCave at the foot of the Palatine Hill in Rome
- Lustre (mineralogy)Manner in which light interacts with a crystal, rock, or mineral's surface
- LutetianSecond age of the Eocene Epoch
- Lutts, TennesseeLutts is an unincorporated community in Wayne County, Tennessee, United States. It is also
- Lwandle plateMainly oceanic tectonic microplate off the southeast coast of Africa
- Lyell MedalBritish geological award
- Lystrosaurus Assemblage ZoneThe Lystrosaurus Assemblage Zone is a tetrapod assemblage zone or biozone which correlates
