Across
- 3. surface is almost like earth
- 6. going around something
- 8. spining on its axis
- 9. mercury has none
- 11. gsses make up earth's ______________.
- 13. path of a revolution
- 14. called "red" planet
- 16. the planets with gaseous surface
- 18. form of water found on mars
- 20. what caused our solar system.
Down
- 1. not considered a planet
- 2. only planet suitable for us to live on
- 4. largest planet
- 5. the gas git wth the longest rotation period
- 7. planets with rocky surfaces
- 10. famous for its rings
- 12. closest planet to the sun
- 15. liquid ______ only found on earth
- 17. name of roman god of sea
- 19. 3 planets have these