Most of the Moon's surface is densely covered with craters, but we find relatively few craters within the lunar maria. What can we conclude?
A) The maria formed after the heavy bombardment ended.
B) The maria formed within the past 1 billion years.
C) The regions of the maria were hit by fewer impacts than the densely cratered regions.
D) Erosion affects the maria more than it affects other regions of the Moon.
A) The maria formed after the heavy bombardment ended.
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