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Kelend t1_iwx231j wrote

Reply to comment by RhymesWith_DoorHinge in Mars was once covered by 300-meter deep oceans, study shows by magenta_placenta

>That's only a quarter as deep as earth's oceans.

Right now, but not when mars had oceans.

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themonkeymoo t1_iwx8nsw wrote

No; not right now, either. It's a lot loser to 1/12; Earth's average ocean depth is ~3700m.

That may have been shallower at some point in the very distant past (which, to be fair, also describes the last time Mars had surface water), but for as long as Earth has had continents it's probably been within rounding error of that value.

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