Across
- 4. not redhouse
- 5. harmful materials into the environment
- 6. CH4
- 7. not alkali
- 9. oxygen molecule
- 12. not cooling
- 14. conforms to the shape of a container
- 15. synonym of international
- 17. h2O
- 19. harmful materials
Down
- 1. saw we breathe with
- 2. used for light
- 3. contains hot lava
- 5. mixture of nitrogen dioxide and other gases
- 8. process by plants which they convert light energy into chemical energy
- 10. living beings
- 11. has atomic number 7
- 13. Ar
- 16. NH3
- 18. has symbol S