Earth has buckled slightly under the weight of its northern polar cap.Mars has not similarly deformed in response to its northern polar cap.This suggests that:

Question

Quizplus · Accepted Answer

The fact that Earth's crust and upper mantle have deformed under the weight of its polar cap suggests that they are less rigid than those of Mars, which have not deformed under the weight of its polar cap. This indicates that the crust and upper mantle of Mars must be more rigid than those of Earth.

Earth Has Buckled Slightly Under the Weight of Its Northern