Lunar maria, the dark, basaltic plains on the Moon, formed near the end of the Late Heavy Bombardment period. This was a time when the Moon, and the inner solar system, experienced a heavy flux of asteroid impacts, approximately 4.1 to 3.8 billion years ago. The impacts created basins that later filled with volcanic lava, forming the maria.

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Lunar Maria Formed

Question 44

Multiple Choice

Lunar maria formed:

A) near the end of the Late Heavy Bombardment.
B) near the beginning of the Late Heavy Bombardment.
C) near the beginning of the Early Bombardment.
D) during the Moon's formation.

Correct Answer: