| A | B |
|---|
| highlands | older, light colored rocks; many craters |
| maria | younger, dark volcanic rocks with fewer impact craters formed by basaltic lava flows |
| regolith | lunar "soil" made when lunar rocks are pulverized by meteor impact |
| waxing | getting bigger |
| waning | getting smaller |
| crescent | mostly dark |
| gibbous | mostly lit |
| quarter | half lit, half dark |
| new | all dark, entire lit side facing away from us |
| full | all lit; entire lit side facing towards us |
| eclipses | temporary darkening of the sun or moon |
| lunar eclipse | occurs when the moon moves into the earth's shadow, so this occurs only at the full moon phase; visible from the entire nighttime side of the earth |
| solar eclipse | occurs when the moon passes directly between the sun and the earth, so this occurs only at new moons; visible only from the daytime side of the earth |
