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.