Across
- 3. our neighboring planet
- 4. moon
- 6. earths forth layer
- 11. protects us from meteoroids
- 13. earths first layer
- 15. our home
Down
- 1. mars is known as this
- 2. volcano
- 5. earths second layer
- 7. earths third layer
- 8. 70% of the earth
- 9. earth has just one of these
- 10. every four years is a?
- 12. moon
- 14. planet type