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Groundwater on Mars
Water held in permeable ground / From Wikipedia, the free encyclopedia
Rain and snow was a regular occurrence on Mars in the past; especially in the Noachian and early Hesperian epochs.[2][3][4][5][6][7] Water was theorized to seep into the ground until it reached a formation that would not allow it to penetrate further (such a layer is called an aquitard and is believed to be impermeable). Water then accumulated forming a saturated layer. Deep aquifers may still exist.[8]
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