Underground layers of rock or soil that hold and carry water, which can be pumped up to supply wells and springs.
From Latin 'aqua' (water) + 'ferre' (to carry). First used scientifically in English during the 19th century to describe subsurface water-bearing formations.
Aquifers are essentially underground oceans—the Ogallala Aquifer beneath the American Great Plains holds more water than Lake Superior, but we're using it up faster than rain can refill it!
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