This list includes 65 Earth science words that start with V, from “V-shaped valley” to “Vug”. It emphasizes common landforms, processes, minerals, and climate terms used in classrooms and fieldwork.
Earth science words that start with V are terms for describing Earth’s materials, features, and dynamic processes. For example, “volcano” is one of the oldest scientific words shared across many languages.
Below you’ll find the table with Term, Definition, Category, Example, and Sources.
Term: The word itself; you can scan this column to locate a specific entry quickly.
Definition: Clear, concise explanation in one or two sentences to help you understand usage.
Category: A short label (landform, process, mineral, climate) to help you filter terms.
Example/Context: Brief note showing how the term appears in nature or study, useful for learning.
Sources: Links or citations to articles and glossaries where you can read more details.
Earth science words that start with V
| Term | Category | Related terms | Typical units / scales |
|---|---|---|---|
| Valley | landform | drainage, floodplain, canyon, valley floor | km, m elevation |
| V-shaped valley | landform | fluvial erosion, incision, stream, youthful landscape | m depth, km length |
| Valley glacier | glaciology | alpine glacier, cirque, ice flow, moraine | km length, m thickness |
| Volcanic island | landform | hotspot, island arc, seamount, lava | km², m elevation |
| Volcano | landform | vent, crater, lava, eruption, magma chamber | m elevation, VEI |
| Volcanism | process | eruption, magma, lava, pyroclastic flows, degassing | n/a |
| Volcanic ash | atmosphere | tephra, ash cloud, aerosol, pumice fragments | mm particle size, km plume height |
| Volcanic bomb | rock | pyroclast, block, lapilli, ballistic projectile | m size |
| Volcanic cone | landform | cinder cone, scoria cone, stratocone, crater | m height |
| Volcanic dome | landform | lava dome, viscous lava, blocky lava | m height |
| Volcanic field | landform | monogenetic cones, lava flows, fissures | km² area |
| Volcanic neck | landform | plug, volcanic plug, intrusive conduit | m height |
| Volcanic plug | landform | neck, intrusion, conduit, dike | m scale |
| Volcanic arc | tectonics | subduction zone, island arc, trench, magmatism | km length |
| Volcanic belt | tectonics | volcanic arc, hotspot track, tectonic margin | km length |
| Volcanic explosivity index (VEI) | measurement | eruption magnitude, plume height, tephra volume | index 0–8 |
| Volcanic gas | atmosphere | SO2, CO2, H2O, fumaroles, degassing | ppm, tons/day |
| Volcanic plume | atmosphere | ash cloud, eruption column, dispersal, wind transport | km plume height |
| Volcanic tremor | seismology | harmonic tremor, magma movement, volcanic earthquake | Hz, amplitude |
| Volcaniclastic | rock | pyroclastic, tuff, lahar, tephra | n/a |
| Volcanogenic massive sulfide (VMS) deposit | rock/mineral | hydrothermal, sulfide, ore, volcanogenic | m scale, tonnes |
| Volcanic glass | rock | obsidian, pumice, rapid cooling, amorphous | n/a |
| Vent | landform | crater, fumarole, conduit, eruption site | m diameter |
| Ventifact | landform | wind abrasion, desert rock, polishing, faceting | cm–m scale |
| Vesicle | rock/mineral | bubble, porosity, pumice, scoria | mm scale |
| Vesicular texture | rock | vesicles, scoria, pumice, porous | n/a |
| Vug | rock/mineral | cavity, crystallization, geode, porosity | mm–cm |
| Vein | rock/mineral | hydrothermal, ore, fracture, mineralization | cm–m width |
| Veinlet | rock/mineral | fine vein, crack, mineral fill | mm–cm width |
| Vermiculite | mineral | phyllosilicate, clay, exfoliation, altered mica | n/a |
| Vitrophyre | rock | glass-dominated porphyritic texture, phenocrysts, volcanic glass | n/a |
| Velocity | measurement | flow speed, seismic velocity, wind speed | m/s, km/h, cm/s |
| Vp/Vs ratio | seismology | P-wave, S-wave, elastic properties | dimensionless |
| Viscosity | measurement | rheology, magma viscosity, fluid resistance | Pa·s |
| Viscous flow | process | ductile deformation, lava flow, creep | m/day, m/year |
| Viscous fingering | process | unstable flow, fluid displacement, porous media | mm–m scale |
| Volatiles | geochemistry | water, CO2, sulfur, degassing, mantle volatiles | wt%, ppm |
| Vapor | atmosphere | water vapor, humidity, condensation, evaporation | kg/m³, % humidity |
| Vapor pressure | measurement | saturation vapor pressure, humidity, evaporation | Pa, hPa |
| Vapor pressure deficit (VPD) | climate/hydrology | humidity, evapotranspiration, plant stress | kPa |
| Vaporization | process | evaporation, boiling, sublimation, latent heat | n/a |
| Vapor intrusion | environmental | soil gas, indoor air, contamination, VOCs | ppm |
| Vadose zone | hydrology | unsaturated zone, water table, infiltration, capillary fringe | m thickness |
| Varve | sedimentology | annual layer, lake sediment, paleoclimate, laminations | mm–cm per year |
| Vegetation index | measurement | NDVI, remote sensing, biomass, chlorophyll | index -1 to 1 |
| Volcanic eruption | process | explosive, effusive, pyroclastic, lava flow | VEI, plume height |
| Volcanic hazard | discipline | lava flow, ashfall, pyroclastic flow, lahar, gas | n/a |
| Volcano monitoring | instrument/discipline | seismology, gas sensors, deformation, satellite remote sensing | Hz, ppm, mm/day |
| Volcaniclastic rock | rock | tuff, ignimbrite, lahars, pyroclastic flow | n/a |
| Volcanic soil | soil science | Andisol, tephra, fertile soil, organic matter | cm depth, pH |
| Volumetric flow rate | measurement | discharge, Q, streamflow, flux | m³/s, L/s |
| Vortex | atmosphere | eddy, cyclone, whirlpool, turbulence | m size, s⁻¹ (vorticity) |
| Vorticity | atmosphere | rotation, circulation, shear, eddies | s⁻¹ |
| Virtual temperature | atmosphere | humidity, density, thermodynamics | K |
| Valley fill | sedimentology | alluvium, infill, terrace, estuary sediment | m thickness |
| Very-long-period earthquake | seismology | VLP, volcanic signals, magma movement | s–min periods |
| Volcano-tectonic earthquake | seismology | VT earthquake, brittle failure, faulting near volcano | magnitude (Mw) |
| Vp/Vs anomaly | seismology | low Vp/Vs, melt detection, fluids | dimensionless |
| Volcanic ash cloud | atmosphere | ash plume, aviation hazard, tephra dispersal | km altitude |
| Volcanic chain | tectonics | island chain, hotspot track, linear volcanism | km length |
| Volcanic scoria | rock | scoria cone, vesicular basalt, pyroclast | n/a |
| Volcanic ashfall | hazard | tephra deposition, ash layer, infrastructure damage | cm thickness |
| Volcanic rock | rock | basalt, andesite, rhyolite, tuff, obsidian | n/a |
| Volcano stratigraphy | discipline | tephrochronology, layers, eruption history | m thickness, years |
| Volcanic conduit | landform | vent, dike, plug, magma pathway | m–km length |
Descriptions
Valley
A low area between hills or mountains carved by rivers or glaciers, often hosting a stream or fertile floodplain.
V-shaped valley
A narrow valley with steep sides and a sharp bottom formed mainly by river erosion (common in upland, actively incising landscapes).
Valley glacier
A tongue-shaped glacier confined to a valley that flows downhill from accumulation areas and shapes the landscape by erosion and deposition.
Volcanic island
An island formed by volcanic activity, commonly from submarine eruptions that build up volcanic rock above sea level.
Volcano
A mountain or vent where magma, gases, and pyroclastic material erupt onto Earth’s surface; ranges from small cones to large stratovolcanoes.
Volcanism
The range of processes by which magma and gases are transported to and released at Earth’s surface, creating volcanic landforms and deposits.
Volcanic ash
Fine fragmented volcanic material ejected during eruptions that can travel long distances, affect air travel, and impact climate and health.
Volcanic bomb
A large blob of molten rock ejected during an eruption that cools and solidifies while airborne, often forming aerodynamic shapes on landing.
Volcanic cone
A conical hill built by erupted lava, ash, and tephra around a vent; types include cinder cones and stratovolcanoes.
Volcanic dome
A steep, dome-shaped mound formed by the slow extrusion of viscous lava that piles up near a vent.
Volcanic field
An area containing many small volcanoes or vents formed over time by repeated eruptions from different spots within a region.
Volcanic neck
A resistant core of solidified magma preserved after the surrounding volcanic cone has been eroded away.
Volcanic plug
A hardened mass of lava that solidified in a vent and can later form a prominent resistant feature when surrounding rock erodes.
Volcanic arc
A curved chain of volcanoes formed above a subducting tectonic plate where melting of the mantle produces magma.
Volcanic belt
A region with clustered volcanic activity often associated with plate boundaries or mantle plumes.
Volcanic explosivity index (VEI)
A logarithmic index ranking eruption strength based on plume height and erupted volume; higher numbers mean more explosive eruptions (USGS).
Volcanic gas
Gases released by volcanoes that influence atmosphere chemistry, climate, and local air quality; common species include water vapor, sulfur dioxide, and carbon dioxide.
Volcanic plume
A towering column of gas, ash, and tephra rising from an eruption that can spread ash over vast areas and affect aviation.
Volcanic tremor
Continuous seismic signal often generated by magma or gas movement beneath a volcano; used in eruption monitoring.
Volcaniclastic
Sedimentary or fragmental rocks composed chiefly of volcanic material produced by explosive eruptions or reworking of volcanic deposits.
Volcanogenic massive sulfide (VMS) deposit
An ore deposit formed on or near the seafloor by hydrothermal fluids associated with volcanic activity, rich in copper, zinc, and lead.
Volcanic glass
Non-crystalline volcanic material formed when lava cools too quickly for crystals to grow; common in obsidian and pumice.
Vent
An opening at Earth’s surface from which magma, gases, or volcanic material are emitted.
Ventifact
A rock shaped, pitted, or polished by wind-driven sand and dust, common in arid environments.
Vesicle
A small cavity in volcanic rock formed by gas bubbles trapped in solidifying lava.
Vesicular texture
A volcanic rock texture characterized by numerous small holes (vesicles) produced by trapped gas bubbles.
Vug
A small cavity in a rock, often lined with mineral crystals formed by later mineral deposition.
Vein
A tabular mineral deposit that fills fractures or cracks, often containing economically important minerals deposited from hydrothermal fluids.
Veinlet
A small, narrow vein or mineral-filled fracture cutting through host rock.
Vermiculite
A layered silicate mineral formed by alteration of mica; swells when heated and is used in soils and industrial applications.
Vitrophyre
A volcanic rock texture where larger crystals (phenocrysts) are embedded in a glassy groundmass.
Velocity
A measure of how fast something moves; in Earth science used for wind, water, magma, and seismic waves.
Vp/Vs ratio
The ratio of compressional (P) to shear (S) seismic wave velocities, used to infer rock composition, fluids, and melt.
Viscosity
A measure of a fluid’s resistance to flow; high viscosity lavas are thick and form domes, low-viscosity lavas flow easily.
Viscous flow
Slow movement of material (e.g., viscous lava or rock) where internal friction dominates, producing rounded morphologies.
Viscous fingering
A pattern-forming instability when a less viscous fluid pushes a more viscous one, relevant to groundwater and petroleum flow.
Volatiles
Low–boiling chemical species dissolved in magma or rocks; they drive eruptions and affect melting, mineral stability, and atmosphere chemistry.
Vapor
The gaseous phase of a substance, commonly water vapor in the atmosphere, which affects weather, clouds, and climate.
Vapor pressure
The partial pressure exerted by a vapor in equilibrium with its liquid or solid phase; key to evaporation and condensation processes.
Vapor pressure deficit (VPD)
The difference between saturation vapor pressure and actual vapor pressure; used to estimate atmospheric demand for moisture and plant stress.
Vaporization
The process by which a liquid becomes a gas; important in the water cycle and energy transfer in the atmosphere.
Vapor intrusion
The migration of volatile contaminants from soil or groundwater into overlying buildings, a concern for indoor air quality.
Vadose zone
The near-surface subsurface above the water table where pores contain both air and water; crucial for groundwater recharge and soil moisture.
Varve
A pair of sediment layers deposited annually in a lake or glacial setting; varve counts can date and reconstruct past climates.
Vegetation index
A remote-sensing metric (e.g., NDVI) that quantifies vegetation greenness and health from satellite imagery.
Volcanic eruption
An event where magma, gas, and tephra are expelled from a volcano; styles range from gentle lava flows to violent explosive eruptions.
Volcanic hazard
Potential harmful effects of volcanic activity on people, infrastructure, and environment; assessed in volcanic risk studies.
Volcano monitoring
The suite of techniques and instruments used to detect signs of unrest and forecast volcanic activity.
Volcaniclastic rock
Sedimentary rock composed predominantly of volcanic fragments transported by gravity, water, or wind and later lithified.
Volcanic soil
Soils derived from volcanic materials that are often fertile and have distinctive properties (e.g., Andisols).
Volumetric flow rate
The volume of fluid passing a point per unit time; commonly used to measure river discharge and groundwater pumping rates.
Vortex
A rotating flow structure in fluids; atmospheric and oceanic vortices include tornadoes, cyclones, and mesoscale eddies.
Vorticity
A measure of local rotation in a fluid flow; important for understanding storms, cyclones, and ocean currents.
Virtual temperature
The temperature that dry air would need to have to match the density of moist air; used in atmospheric stability calculations.
Valley fill
Sediments that accumulate within a valley during times of reduced erosion or rising base level, often producing flat valley bottoms.
Very-long-period earthquake
Seismic events with periods of tens to hundreds of seconds, often associated with slow magmatic or hydrothermal processes beneath volcanoes.
Volcano-tectonic earthquake
A short, high-frequency earthquake caused by brittle fracturing of rock near a volcano, often preceding eruptions.
Vp/Vs anomaly
Areas where the Vp/Vs ratio deviates from background values, used to infer presence of melt, fluids, or altered rock.
Volcanic ash cloud
A suspended mixture of fine volcanic particles and gases rising from an eruption that can disrupt air traffic and affect climate.
Volcanic chain
A linear series of volcanoes formed by plate motion over a mantle hotspot or along tectonic features.
Volcanic scoria
A dark, vesicle-rich volcanic rock formed from gas-rich magma; commonly builds cinder cones.
Volcanic ashfall
Deposition of volcanic ash from an eruption that can bury landscapes, contaminate water, and damage machinery.
Volcanic rock
Igneous rocks formed from cooled lava or pyroclastic material; classification depends on chemistry and texture.
Volcano stratigraphy
Study of layered volcanic deposits to reconstruct eruption sequences and volcanic history.
Volcanic conduit
A subsurface channel through which magma rises to the surface during volcanic activity.