Across
- 2. habitable planet in our solar system
- 3. this is needed to breathe
- 6. water needs to be in this form to have life
- 7. just enough of this is needed but not too much
- 9. planets need to have a circular or near circular one
- 10. regulates Earth's atmosphere by moving plates
Down
- 1. field needed to protect from solar wind & cosmic rays
- 4. another name for the habitable zone
- 5. a star that the planet revolves around
- 8. need to have a stable rotation on its _____