| A | B |
|---|
| axis | the imaginary line that the earth rotates on |
| revolution | one full orbit of the earth around the sun |
| summer | season of direct sunlight |
| winter | season of indirect sunlight |
| moon | a satellite of the Earth |
| orbit | the path a planet takes around the sun |
| sun | the source of energy for the Earth |
| solar system | the giant collection of space bodies |
