Earth Day

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Across
  1. 2. layers of gases surrounding earth
  2. 5. to protect from harm or destruction
  3. 8. convert into usable material
  4. 12. trash of the sidewalk
  5. 13. decayed organic material
  6. 15. food produced without the use of chemical fertilizers or pesticides
  7. 17. surroundings a person, plant or animal lives or operates
  8. 18. capable of being renewed
  9. 19. garbage dump
  10. 20. to contaminate with harmful poisonous substance
Down
  1. 1. reuse
  2. 3. no longer in existence
  3. 4. community of interacting organisms and their physical environment
  4. 6. relating to the sun
  5. 7. branch of biology
  6. 9. production and discharge of something
  7. 10. able to be maintained at a certain level
  8. 11. to maintain to its original state
  9. 14. a colorless gas which is a poisonous form of oxygen
  10. 16. where an animal lives