Across
- 2. using something again
- 7. decompose the organic matter
- 11. does not originate in single source
- 12. radiation that is produced by the sun
- 13. Natural
- 19. richness of nutrients
- 20. next in order pollutants
- 23. caused or produced by humans
- 24. second layer of the atmosphere
- 25. pollution outside
- 27. Macroscopic
- 28. converting waste materials into new materials
- 29. compounds of sulfur and oxygen
- 30. Not natural
Down
- 1. chemical formula CH4
- 3. CO
- 4. Chlorofluorocarbons
- 5. single source
- 6. oxygen zone
- 8. matter in particulate form.
- 9. recovering energy
- 10. metals that are toxic
- 14. minimizing waste
- 15. hazardous waste
- 16. composed of nitrogen and oxygen
- 17. pollution inside
- 18. main pollutants
- 21. causes pollution
- 22. destruction of something
- 26. site for the disposal of waste