Why in Artesian well a layer of porous rock is kept in between two layers of non-porous rock?
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Enter your search terms: artesian well, deep drilled well through which water is forced upward under pressure. The water in an artesian well flows from an aquifer, which is a layer of very porous rock or sediment, usually sandstone, capable of holding and transmitting large quantities of water.
Explanation:
An artesian well is a well that taps into a confined aquifer (see Figure 1) . Under artesian pressure, water in the well rises above the top of the aquifer, but does not necessarily reach the land surface .
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