What appears to be the "impact history" of cratering on the Moon?
A) More-or-less constant bombardment from the earliest times to the present
B) Heaviest bombardment when the Moon first formed,gradually decreasing (except for increased activity about 4 billion years ago)to light bombardment today
C) Short periods of heavy bombardment alternating with long periods of light bombardment throughout the Moon's life
D) An early period of heavy bombardment followed by a decrease in intensity (except for a spike around 4 billion years ago)and then very light bombardment to the present

Question

Quizplus · Accepted Answer

Evidence suggests that the Moon experienced an early period of heavy bombardment following its formation, which then decreased in intensity with occasional spikes (such as around 4 billion years ago). The Moon has been experiencing very light bombardment since then.

What Appears to Be the "Impact History" of Cratering on the Moon