Across
- 2. no definite shape
- 7. loose molecules
- 10. atmosphere with weather
- 14. checks temp
- 15. big star
- 16. main gas in air
- 20. first man on moon
- 21. Has a definite shape
Down
- 1. made by star
- 3. hot atmosphere
- 4. stays the same
- 5. water to gas
- 6. energy moves
- 8. has layers
- 9. planet known for life
- 11. fossil fuel
- 12. makes astroids heat up
- 13. smallest unit
- 17. invisible force
- 18. outer space
- 19. non-renewable