| A | B |
|---|
| rotation | spinning |
| axis | an imanginary line through the North and South poles |
| revolution | the movement of one object through another |
| orbit | the path that Earth follows around the sun |
| force | a push or pull |
| gravity | the force that attracts all objects toward each other |
| mass | the amount of matter in an object |
| inertia | the tendency of an object to not change its motion |
| Newton's first law of motion | a law that states an object at rest will stay at rest and that an object in motion will stay in motion |
| phases | the different shapes of the moon that you can see |
| eclipse | when an object in space comes between the sun and another object |
| solar eclipse | when a new moon blocks your view of the sun |
| tides | the regular rise and fall of ocean water |
| spring tide | the highest possible high tide |
| neap tide | the lowest possible high tide |
| telescope | makes faraway objects appear closer |
| maria | the moon's dark flat areas |
| craters | large round pits on the moon |
| meteriod | a chunk of rock or dust from space |
