Useful hints to study:
*The four phases of the moon.
*What is mare?
*What are craters?
*What are rays?
*Does the moon have air, water, or wind?
*If the earth was flat how many moons could fit across it?
*If the earth were hollow how many moons would fit inside it?
*What does rotate mean?
*What does revolve mean?
*How many days does it take for the moon to revolve around the earth?