Across
- 7. found in all cells
- 8. hot ball of fire
- 9. important natural cycle
- 13. its an important part of the atmosphere
- 14. the four seasons
- 15. it is reused
- 17. where plants grow and animals live
- 18. remains of a living thing
- 20. earths surface
Down
- 1. found in all living things
- 2. A member of a large group of unicellular microorganisms lacking organelles
- 3. water on the earths surface
- 4. an individual
- 5. gases, gases that trap heat close to the earths surface
- 6. a liquid substance
- 10. particular air
- 11. a living thing other than a human being
- 12. humans live on it
- 16. prevailing weather conditions
- 19. humans survive by breathing it