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Groundwater is located beneath the ground surface in soil pores, rock pores, and fractures.
Groundwater is water stored beneath Earth's surface in the pore spaces of soil and rock and within fractures in rock formations. It accumulates below the water table, where these spaces become completely saturated. Permeable rock or unconsolidated material that can provide a usable quantity of groundwater is called an aquifer. Groundwater is naturally recharged when precipitation, streams, and rivers infiltrate and percolate downward, and it may return to the surface through springs, seeps, wetlands, or discharge into oceans. It can also be extracted through wells for drinking water, agriculture, industry, and other uses. Groundwater is widely distributed and represents about 30% of the world's readily available freshwater, or roughly 99% of Earth's liquid freshwater. It occurs in many types of geological settings, including sedimentary basins, alluvial river valleys, fractured rocks, karst formations, and large confined aquifer systems such as Australia's Great Artesian Basin. Groundwater storage can be much greater than surface-water storage and may remain underground for days to millions of years. Its distribution, quality, and availability depend on geology, climate, topography, recharge rates, and human extraction.
Groundwater is located beneath the ground surface in soil pores, rock pores, and fractures.
The water table marks the upper boundary of the zone where subsurface materials are fully saturated.
An aquifer is a permeable rock or sediment layer capable of yielding usable groundwater.
Groundwater is recharged mainly by precipitation and infiltrating surface water and is discharged through springs, seepage, wells, and ocean outflow.
Groundwater makes up about 30% of the world's readily available freshwater and about 99% of its liquid freshwater.
Groundwater occurs in shallow and deep aquifers across sedimentary basins, river-valley deposits, fractured rocks, and karst systems.
Groundwater storage is often larger and slower to renew than surface-water storage, making it valuable but vulnerable to overuse.
Water stored or moving beneath Earth's surface within soil pores, rock pores, and fractures.
A permeable layer of rock or unconsolidated sediment that can yield a usable quantity of groundwater.
The underground level below which soil pores and rock openings are completely saturated with water.
The process by which water moves downward from the surface into an aquifer.
The release of groundwater to the surface, rivers, wetlands, oceans, or wells.
An aquifer trapped between layers of low-permeability or impermeable material and commonly under pressure.
An aquifer whose upper boundary is the water table and which is directly connected to surface recharge.
The study of the distribution, movement, storage, and properties of groundwater.
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