Across
- 1. wave
- 3. ecology
- 6. volcano
- 8. it is necessary
- 9. to preserve
- 11. sky
- 12. to clean
- 17. cactus
- 18. should, ought to
- 20. a large waterfall
- 25. tree
- 27. island
- 28. to protect
- 30. smog
- 31. to save
- 34. recycling
- 36. bay
- 38. a small waterfall
- 40. nature
- 41. to have to
- 44. jungle
- 45. Earth
Down
- 1. mountain
- 2. deforestation
- 4. valley
- 5. oil
- 7. industrial waste
- 10. Palm tree
- 13. to recycle
- 14. to take care of
- 15. coast
- 16. natural resources
- 19. grasslands
- 21. environment
- 22. desert
- 23. river
- 24. pollution
- 26. cloud
- 29. to destroy
- 32. grass, pasture
- 33. sea
- 35. forest
- 36. hill
- 37. to save, economize
- 39. peninsula
- 42. sand
- 43. plain