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Vlad [161]
3 years ago
8

What makes us think that mars must once have had an atmosphere that was warmer and had higher surface pressure?

Physics
1 answer:
valina [46]3 years ago
6 0
There must once have been a lot of outgassing, and hence a thicker atmosphere. b. The atmosphere is too cold and thin for liquid water today, yet we see evidence that water flowed on the surface in the past.
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