Which is NOT a reason that we suspect Mars once had liquid water on its surface?
A) Mapping satellites have detected dry river beds.
B) Rovers have detected minerals that must have formed in the presence of liquid water.
C) Mapping satellites have detected outflow channels coming from impact craters.
D) The observed presence of water ice in Mars's polar icecaps.
E) All of the above are reasons.

Question

Quizplus · Accepted Answer

The presence of water ice in Mars's polar icecaps is a direct indication that Mars once had water, so it is not a reason that we suspect Mars had liquid water on its surface. The other options are all evidences that suggest Mars had flowing liquid water on its surface in the past.

Which Is NOT a Reason That We Suspect Mars Once