Keiaysha's puzzle

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Across
  1. 4. layer of earth
  2. 7. less in amount
  3. 9. maintained
  4. 10. reusable material
  5. 11. young animals
  6. 15. comes before the ozone
  7. 16. - rising tempature
  8. 18. poisonous substances
  9. 19. able to be renewed
  10. 20. decayed organic material
Down
  1. 1. no longer on earth
  2. 2. dispose of refuse
  3. 3. decomposed by bacteria
  4. 5. living matter
  5. 6. enviornment
  6. 8. discharge of something
  7. 12. living organisms
  8. 13. sun related
  9. 14. life and vitality
  10. 17. emission of ionizing