A new map of Earth’s groundwater supply shows where on the planet water is locked up and “hidden” underground.
The map — the first of its kind — provides a visual representation of Earth’s groundwater resources and estimates that the planet’s total groundwater supply stands at approximately 5.5 million cubic miles (about 23 million cubic kilometers).
Groundwater is the source of the world’s second-largest collection of freshwater, according to the National Ground Water Association. (The planet’s primary source of fresh water comes from glaciers and ice caps.) Groundwater is collected from rainfall that seeps underground into aquifers and reservoirs beneath the land surface, according to the U.S. Environmental Protection Agency (EPA).
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Source Credits: Elizabeth Newbern in LiveScience