What is the water cycle and how does it relate to groundwater supplies?

The earth has limited supplies of water. Groundwater and surface water are essentially one resource, physically connected by the water cycle in which water evaporates, forms clouds, and falls to the ground as rain or snow. Some of this precipitation seeps into the ground and becomes groundwater that moves slowly into an underground aquifer.  If there is no precipitation, then there is no water returning to the groundwater below and the groundwater supply is not “recharged” or refilled.

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