| Question |
Answer |
| phase | portion of the illuminated side of the moon that we see from earth |
| waxing | period of the moon's revolution in which Earth can see an increasing amount of the lighted side of the moon |
| waning | Earth can see an decreasing amount of the lighted side of the moon |
| crescent | shape of the moon when a small sliver of light is visible from earth |
| gibbous | shape of the moon between quarter and full |
| impact theory | most widely accepted theory of the moon's formation - states that a large object collided with earth and the debris from the collision joined together to form the moon |
| maria | smooth plains on the moon, made of basalt, dark-colored |
| highlands | mountainous area of moon with lots of craters, made of breccia, and light-colored |
| Apollo | NASA program whose goal was to land a man on the moon and return him safely to earth |
| eleven | this Apollo mission was the first that was able to land men on the moon and allow them to walk on moon |
| synchronous rotation | this is the reason we see the same side of the moon from earth - it means that the moon's revolution period and rotation period is equal (about 28 days) |
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