When were the Moon's mare basins formed?
A) During the early heavy bombardment era (around 4.5 billion years ago)
B) During the final epoch of heavy bombardment (around 4.0-3.8 billion years ago)
C) During the time of the dinosaur extinction (around 250 million years ago)
D) None of these

Question

Quizplus · Accepted Answer

The Moon's mare basins were formed during the final epoch of heavy bombardment, which occurred around 4.0-3.8 billion years ago. This was a period of intense meteorite impacts on the Moon's surface, and these impacts were responsible for creating the large, basin-like structures known as mare basins.

When Were the Moon's Mare Basins Formed