Why are impact craters rare on the surface of earth but plentiful on the moon?

Impact craters are rare on the surface of the earth and plentiful on the moon its because our atmosphere burns up more meteoroids before they meet the surface. Another reason is that the surface of the earth is continually active and erases the marks of crater overtime. There are also many other large craters being found in Canada, Australia and Africa. 

The correct answer is:   [b]:   "has no atmosphere" .

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