The crust of Mars is believed to ____ Earth's.
A) be much thinner than
B) be younger than
C) contain more water than
D) be more geologically active than
E) none of the above

Name: The crust of Mars is believed to ____ Earth's. A) be much thinner than B) be younger than C) contain more water than D) be more geologically active than E) none of the above
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Mars' crust is generally thicker than Earth's, older, contains less water, and is less geologically active.

The Crust of Mars Is Believed to ____ Earth's