1. On the basis of lunar rocks brought back by the astronauts, explain why the maria are dark-colored, but the lunar highlands are light-colored. 2. Why are there so few craters on the maria? 3. To...

1. On the basis of lunar rocks brought back by the astronauts, explain why the maria are dark-colored, but the lunar highlands are light-colored.

2. Why are there so few craters on the maria?

3. To review the crater formation history in the solar system, do Interactive Exercise 6-4 and print out or sketch the completed diagram.