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.

Question

Quizplus · Accepted Answer

The craters on Mercury appear to have been produced by impacts from objects early in the planet's history. This is supported by the fact that the craters are densely packed and appear to be superimposed on one another, suggesting that they were formed over a long period of time. Additionally, the lack of erosion on the planet's surface indicates that these craters were likely formed early in the planet's history, before erosion processes had a chance to wear them down.

Craters on Mercury Appear to Have Been Produced by