The extreme size of volcanoes on Mars indicates that
A)Mars has a much thicker crust than Earth.
B)water once flowed in streams on Mars.
C)large moving plates have not formed on Mars.
D)Mars has a much thicker crust than Earth and large moving plates have not formed on Mars.
E)Mars has a much thicker crust than Earth, water once flowed in streams on Mars, and large moving plates have not formed on Mars.

Question

Quizplus · Accepted Answer

The extreme size of volcanoes on Mars indicates that large moving plates have not formed on Mars, which suggests that the planet does not have active plate tectonics like Earth. Additionally, the fact that Mars has volcanoes that are much larger than any on Earth suggests that the planet has a much thicker crust. Therefore, the best choice is D, which combines both of these explanations. The possibility of water once flowing in streams on Mars is not necessarily indicated by the size of the volcanoes.

The Extreme Size of Volcanoes on Mars Indicates That