Multiple Choice
Which one of the following pieces of evidence SUPPORTS the existence of tectonic activity in the Martian past?
A) The crust is everywhere thicker than Earth's crust.
B) There are large,isolated hot-spot volcanoes.
C) Valles Marineris,a long valley system,has been observed.
D) There is no planet-wide magnetic field.
Correct Answer:
Verified
Correct Answer:
Verified
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