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What is groundwater?

Groundwater is water that flows or seeps downward and saturates soil or rock, supplying springs and wells. Groundwater often begins as precipitation and soaks into the ground where it is stored underground in rock crevices and in the pores of geologic materials (these are aquifers), the same way as water fills a sponge. The upper surface of the saturated zone is called the water table.

Learn more:

USGS Groundwater Information Pages

The USGS Water Science School

USGS Groundwater Data for the Nation

 

 

Tags: Groundwater, Water, Properties, Chemistry, Aquifers