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 other choices are correct.

Question

Quizplus · Accepted Answer

The flow patterns and the presence of craters suggest that Mars had a different climate billions of years ago. The flow patterns could be the result of ancient rivers, lakes, or even oceans, which have disappeared due to changes in the planet's atmosphere and climate. The number of craters on top of the flow patterns suggests that they are old and have not been active for a long time. This indicates that Mars had a wetter and warmer past and has evolved to its current cold and dry environment.

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