Define confined and unconfined aquifers.
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Unconfined aquifers are those into which water seeps from the ground surface directly above the aquifer.Confined aquifers are those in which an impermeable dirt/rock layer exists that prevents water from seeping into the aquifer from the ground surface located directly above.
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A confined aquifer is an aquifer below the land surface that is saturated with water.
A unconfined aquifer is an aquifer whose upper water surface (water table) is at atmospheric pressure, and thus is able to rise and fall.
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