56 chapter 16

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Across
  1. 3. keep safe from
  2. 9. seriously at risk of extinction
  3. 10. converting waste into reusable materials
  4. 11. problem
  5. 15. introduction of harmful materials into environment
  6. 16. disappearance
  7. 18. invisible gaseous substance surrounding the earth
  8. 19. the natural home of animals
  9. 21. occur
  10. 22. latest
  11. 23. damage
  12. 26. a four-wheeled vehicle
  13. 27. dangerous
Down
  1. 1. combustion
  2. 2. preservation and protection of something
  3. 4. application of scientific knowledge
  4. 5. the natural world
  5. 6. transforming a wooded land into a cleared land
  6. 7. the native fauna (and sometimes flora) of a region
  7. 8. greatest
  8. 12. a gradual increase of overall temperature (2words)
  9. 13. a method of moving people from one place to another place
  10. 14. business/corporation
  11. 17. materials
  12. 20. a community where you live
  13. 24. seas
  14. 25. woodland
  15. 28. landslips