Why do scientists think Mars once had liquid water on the surface? Please help!!!!!!!!!!!!!!!!! (Homework due tomorrow!!!)

asked Dec 4, 2015 227k views

1 vote

Why do scientists think Mars once had liquid water on the surface?

Please help!!!!!!!!!!!!!!!!!

(Homework due tomorrow!!!)

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7 votes

scientists this this as mars contains polar ice caps
and so that ice must have come from somewhere

Peter Knego answered Dec 11, 2015

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