U4 Vocabulary

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Across
  1. 3. glacier
  2. 5. air
  3. 9. to be extinct
  4. 12. flood
  5. 15. spill
  6. 16. to contaminate / to pollute
  7. 18. natural disasters
  8. 20. earthquake
Down
  1. 1. to threaten
  2. 2. smog
  3. 4. pesticides
  4. 6. natural resources
  5. 7. hurricane
  6. 8. drought
  7. 10. factory
  8. 11. habitat
  9. 13. deforestation
  10. 14. to become aware of
  11. 17. to melt
  12. 19. to appreciate/to value