What Is "Groundwater"?

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Map of Ogallala AquiferGroundwater is the water found underground in the tiny cracks and spaces between layers of rocks, soil, and sand. Groundwater comes from rain and melting snow that seeps into the soil and collects in underground reservoirs called aquifers. The Ogallala Aquifer is like a huge bucket of gravel filled with water that lies beneath parts of eight states in the central plains, including Nebraska. Most of the water in the Ogallala Aquifer has been held there for thousands of years.