Nature and The Environment

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Across
  1. 5. blocked or crowded
  2. 6. grow
  3. 7. few people living in a large area
  4. 8. the protection of plants, animals & nature
  5. 12. air
  6. 14. a group of people born in the same period of time
  7. 16. able to be used again and again
  8. 17. a facial expression which means you're confused
  9. 18. the place we live
  10. 19. people living in a certain area
  11. 21. substances if you eat these, you'll get very sick or die
  12. 22. unusual
Down
  1. 1. something you do with your nose
  2. 2. populated many people living in a very small area
  3. 3. dirty air
  4. 4. when you guess the meaning of something from the information you have
  5. 7. the area around you
  6. 9. visibility unable to see clearly or far
  7. 10. damage caused to the environment
  8. 11. to use things again
  9. 13. to enable rubbish to be used again
  10. 15. to to talk or write about somebody or something
  11. 20. a long passage under the ground
  12. 23. to use less than before