Permeable rocks like sedimentary sandstone and limestone are ideal for aquifers as they yield significant water, while impermeable rocks such as igneous and metamorphic form confining layers.
Permeability refers to the ability of a geologic material to transport fluids. Rocks that are permeable make good aquifers, able to yield significant water. Sedimentary rocks such as sandstone and limestone are good aquifers, while rocks like igneous or metamorphic that are impermeable make confining layers.
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