Across
- 3. forest
- 6. erosion
- 8. ecology
- 9. oil
- 10. flood
- 12. greenhouse effect
- 13. nature
- 18. recycling
- 20. plains
- 21. deforestation
- 22. biodiversity
- 23. waterfall
- 24. future
Down
- 1. earthquake
- 2. Earth
- 4. garbage dump
- 5. industrial waste
- 7. drought
- 11. development
- 14. fresh air
- 15. pollution
- 16. rain-forest/jungle
- 17. hill
- 19. sand