Across
- 4. Layer protecting Earth from UV rays?
- 6. Gas plants take in from air?
- 8. Average weather condition of a place?
- 9. Living organisms and environment together?
- 11. Essential natural resource for life?
- 13. Variety of life on Earth?
- 15. Minimizing waste generation?
- 16. Protection of natural resources?
- 17. Contamination of environment?
- 18. Natural flowing water body?
Down
- 1. Top layer of earth for plants?
- 2. Using items again?
- 3. Mixture of gases we breathe?
- 5. Large area covered with trees?
- 7. Cutting down trees?
- 10. Gas humans need to breathe?
- 12. Process of reusing waste?
- 14. Large saltwater body?