| A | B |
|---|
| rotation | earth spinning around on its axis (24 hours) |
| axis | imaginary line through the North and South poles |
| revolution | movement of one object around another |
| orbit | path the Earth follows around the sun |
| solstice | when the sun is farthest north or south of the equator |
| equinox | day and night are equal amounts of time |
| force | push or pull |
| gravity | attracts all objects toward each other |
| mass | amount of matter in an object |
| weight | force of gravity on an object |
| inertia | tendency of an object to resist a change in motion |
| moon phases | different shapes of the moon you see from Earth |
| solar eclipse | when a new moon passes directly between Earth and the sun |
| umbra | very darkest part of a shadow |
| penumbra | less dark part of the shadow |
| lunar eclipse | when the Earth is directly between a full moon and the sun |
| spring tide | highest high tide |
| neap tide | lowest high tide |
| telescope | device to observe distant objects |
| maria | dark, flat areas |
| craters | large, round pits on the moon |
| meteoroid | chunk of rock or dust from space |
| highlands | mountains |
