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

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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There used to be substantial water on Mars.
User Vitaliy Prushak
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liquid water once existed
User Nowaq
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