Across
- 4. river
- 5. ozone
- 7. Carbon dioxide
- 9. dunes
- 10. deserts
- 12. volcanos
- 14. birds
- 16. snow
- 17. minerals
- 19. glacier
- 20. caves
- 21. sand
- 24. plants
Down
- 1. ice
- 2. people
- 3. rocks
- 6. oxigen
- 8. wind
- 11. fish
- 13. iceberg
- 15. animals
- 16. clouds
- 17. sea
- 18. lake
- 22. tree
- 23. mountains