| A | B |
|---|
| planet | heavenly body that moves around the sun and gives off no light of its own |
| atmosphere | the layer of air that surrounds Earth |
| axis | imaginary line that goes through Earth from pole to pole |
| rotate | to make a complete turn |
| rotation | complete turn on its axis |
| orbit | the path of one object in space around another object |
| revolution | the trip of an object (Earth) makes in going once around another object (sun) |
| revolve | make one complete turn |
| northern hemisphere | the half of Earth north of the equator |
| equator | imaginary line that circles the globe halfway between the North Pole and the South Pole |
