Bieener's learning tree #3

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Across
  1. 1. the composite or generally prevailing weather conditions of a region.
  2. 4. a period of dry weather.
  3. 5. homosapiens are.
  4. 6. nobody knows the meaning of_____.
  5. 8. school can be a safe.
  6. 9. a social group of any size whose members reside in a specific place.
  7. 10. is an atmospheric phenomenon,caused by short-wave radiation,being readily transmitted through the earth's atmosphere.
  8. 13. a place where animals live.
  9. 14. taking on the characteristics of a city.
  10. 15. is an increase in the earth's average atmospheric tempature.
  11. 17. a mixture of various decaying organic substances used for fertilizing soil.
  12. 18. to make full or complete again.
  13. 19. the introduction of harmful substances or products into the environment.
  14. 21. a system formed by the interaction of a community of organisms with their environment.
  15. 22. the ___ layer.
  16. 23. to cut back
Down
  1. 2. we blame most terrible weather conditions on this person.
  2. 3. to use again.
  3. 7. capable of decaying through the action of living organisms.
  4. 11. no longer in existence,that has died out.
  5. 12. a place where things are made a shipped out.
  6. 16. the thing that is around the earth.
  7. 20. mother ____.