what forms underground water
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Explanation:
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Explanation:
Groundwater forms when water from the surface seeps into the ground. This process is called recharge. The water is able to move underground through the rock and soil due to connected pore spaces. These pore spaces can be tiny spaces within particles in the rock or soil, fractures in the bedrock, or dissolved cavities in limestone, like caves.
During recharge, water is pulled downward into the earth by gravity through two zones. The upper zone, called the zone of aeration, is where a mixture of water and air fills the pore spaces. Below the zone of aeration is the zone of saturation, where the pore spaces are completely filled by water. The upper boundary of the zone of saturation is known as the water table.
The area that is saturated with water is called an aquifer. An unconfined aquifer is where the aquifer is connected to the surface through pore spaces. A confined aquifer is an aquifer that is restricted between two impermeable rock units. Confined aquifers are only accessed using a well or where the aquifer meets the surface.
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