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On Earth, almost all evidence of early extraterrestrial impact events has been erased by erosion, biological activity, and continental drift. On the Moon, there is no such erasure. Its surface contains an intact chemical record of all the asteroids that have ever struck it. Thus, when scientists examined rocks brought back from the Moon, they expected to find that most debris had been formed during the solar system's creation. The prevailing hypothesis held that the solar system had formed in a steady progression from disorder to order, with many initial lunar impacts rapidly tapering off as space debris diminished. However, analyses found that most of the lunar material had been created by impacts 3.9 billion years ago, 700 million years after the solar system's formation.

According to the passage, which of the following can be at least partially attributed to continental drift on Earth' s surface?

A.Few rock samples from Earth can be confidently dated as older than 3.9 billion years.
B.It is impossible to determine the continent on which most asteroids fell.
C.Asteroids that have impacted Earth cannot be distinguished by the continent on which they landed
D.Evidence from extraterrestrial impacts that might yield clues to the formation of the solar system is scarce.
E.Only certain regions on Earth contain intact chemical records of the asteroids that have pummeled them.

D显示答案

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