A distinct area of unusually jumbled, hilly terrain has been found on Mercury. How is this terrain believed to have been formed?
A) by an intense shower of meteoroids near the end of the heavy bombardment era
B) by upwelling of magma while Mercury was still hot enough for its mantle to be tectonically active
C) by the impact of a large comet
D) by seismic waves generated by the Caloris impact
Correct Answer:
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Q28: Mercury can be characterized as having
A) a
Q29: The planet with the highest overall density
Q30: The Caloris Basin, a huge circular region
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