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Ground ice |
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| Instead, he notes, the small amount of water "may just be very local melting of near-surface ground ice," warmed by the planet's internal heat or perhaps by the sun during periods when the north or south pole is tilted closer to the sun. A large body of evidence now suggests that Mars' highland crust contains the planet's major reservoir of water, stored as ground ice since an earlier, wetter epoch on the planet. |
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Ground ice
