The flow patterns found on the surface of Mars and the number of craters on top of them suggest that
A) Mars is today a liquid, water-rich world.
B) the climate on Mars was different billions of years ago.
C) volcanism is occurring on Mars.
D) the polar caps are made of liquid water.
E) all of the above.

Question

Quizplus · Accepted Answer

The flow patterns and craters on the surface of Mars suggest that the climate on Mars was different billions of years ago, possibly allowing liquid water to exist on the surface. There is currently no evidence of liquid water on Mars.

The Flow Patterns Found on the Surface of Mars and the Number