Author Question: If a major asteroid collision in the asteroid belt occurs, on average, 1 time in 100,000 years, then ... (Read 109 times)

PhilipSeeMore · **on:** Jul 27, 2018

If a major asteroid collision in the asteroid belt occurs, on average, 1 time in 100,000 years, then how many major collisions have occurred over the approximately 4 billion year history of the solar system?

A) about 4,000 B) about 4 billion C) about 40,000 D) about 4 million

Question 2

The lunar mare are found

A) uniformly all over the Moon.
B) only in the dark areas of the lunar poles, where water is not boiled away.
C) mainly on the near side.
D) mainly on the far side.
E) only as layered rocks, since the original water was lost long ago.