Across
- 4. nitrogen is important to animals by
- 8. water that falls from atmosphere
- 9. living organisms on the planet
- 11. carbon moves from atmosphere to plants
- 13. water 3% is
- 15. carbon moves from living thing to
- 16. form commonly used by plants
- 17. air surrounds earth
- 20. water stored under surface of earth
Down
- 1. water is changed back into liquid water
- 2. all water on earth
- 3. occurs because of heat from sun
- 5. carbon moves from plants to animals
- 6. can be converted into forms usable for plants & animals
- 7. divided into how many spheres?
- 10. plants use water to help make energy
- 12. carbon moves from plants and animals to
- 14. always been present on earth
- 18. what water can become
- 19. 97% is