Craters on Mercury Appear to Have Been Produced by

question 77

Multiple Choice

Craters on Mercury appear to have been produced by

• A) impacts by objects from space continuously throughout the planet's history,including very recently in geological time.
• B) volcanic eruptions early in the planet's history.
• C) successive expansion and contraction of the planet's surface,caused by intense heating by the Sun and severe cooling during rotation,because the craters appear to be in irregular lines across the surface.
• D) impacts from objects early in the planet's history.

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