Across
- 5. rain
- 6. vapor
- 10. a chemical
- 11. cycle
- 12. a cycle
- 13. natural gas
- 15. evaporation
- 16. an element
- 17. cycle
Down
- 1. water on the surface
- 2. converting nitrogen compounds
- 3. hot and wet
- 4. bacteria in soil
- 7. what you breathe
- 8. at night its wet in summer
- 9. cycle
- 14. water in the ground