Fossil water

"Fossil water" or paleowater is a somewhat broadly-used term to describe water that has been contained in some undisturbed space, usually groundwater in an aquifer, for millennia. Fossil water could also describe ancient water on other planets, or water sealed in subglacial lakes such as Antarctica's Lake Vostok. "Fossil groundwater" can be defined as "water that infiltrated usually millennia ago and often under climatic conditions different from the present, and that has been stored underground since that time.".
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