U7 crucigrama (1-3)

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Across
  1. 2. ecosystem
  2. 3. to make aware
  3. 4. hole
  4. 5. can
  5. 7. hail
  6. 8. to report/denounce
  7. 10. astronomer (f)
  8. 11. deforestation
  9. 13. glass
  10. 15. frost
  11. 19. cloud
  12. 20. to threaten
  13. 21. mammal
  14. 24. to shine
  15. 26. greenhouse effect
  16. 27. thunder
  17. 28. rainbow
  18. 31. plastic container
  19. 34. cardboard
Down
  1. 1. meteorite
  2. 4. to run out
  3. 6. battery
  4. 9. climate change
  5. 12. ozone layer
  6. 14. galaxy
  7. 16. heavy shower
  8. 17. oil spill
  9. 18. constellation
  10. 22. protected species
  11. 23. to promote/encourage
  12. 25. amphibian
  13. 29. drop
  14. 30. telescope
  15. 32. bird
  16. 33. fish