Across
- 2. rock from space that hits earth
- 5. period how long it takes a planet to go around the sun
- 6. top layer of earth
- 8. most important gas in our atmosphere
- 10. imaginary line that divides the earth in half
Down
- 1. when particles of solar wind collide w earth gasses
- 2. ball of magnetic power around earth
- 3. what everything around you is made of
- 4. layer under top layer
- 7. center layer of earth?
- 9. measure of how much matter
- 11. what is a shooting star made of