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martain surface features include gullies and runoff channels which suggest that on the surfave of mars
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martain surface features include gullies and runoff channels which suggest that on the surfave of mars

User Jako Basson
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4 votes
There used to be substantial water on Mars.
User Vitaliy Prushak
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4 votes
liquid water once existed
User Nowaq
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8.2k points
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