Based on the age of the light- and dark-colored regions of the Moon and the number of craters observed in these regions,we know that impacts in the inner Solar System
A) rapidly decreased approximately 3 billion years ago.
B) rapidly decreased approximately 1 billion years ago.
C) were very rare in the last 4.5 billion years.
D) occurred at approximately a constant rate throughout most of the age of the Solar System.

Question

Quizplus · Accepted Answer

The light-colored highlands of the Moon are heavily cratered and older, while the dark-colored maria are less cratered and younger, indicating a period of heavy bombardment that decreased rapidly about 3 billion years ago.

Based on the Age of the Light- and Dark-Colored Regions