Earth Day

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Across
  1. 6. The surroundings in which an organism lives
  2. 7. To convert waste into reusable things
  3. 9. Organic Material used as fertilizer for plants
  4. 10. To reuse something that will make it a product of better quality
  5. 12. Able to be maintained
  6. 14. The study of organisms
  7. 16. A gas that is a natural part of the environment
  8. 17. An organism that is no longer existing
  9. 18. Trash left lying in an open space
  10. 19. Something that is not deprived when used
Down
  1. 1. Created from living matter
  2. 2. To maintain something in its original state
  3. 3. The gases that surround the Earth
  4. 4. A place to get rid of trash by burying it and covering it with soil
  5. 5. The act of contaminating an environment
  6. 6. The production/discharge of something, especially gas
  7. 8. A community of organisms and their environment
  8. 11. To protect a place or organism
  9. 13. Relating to or caused by the sun
  10. 15. The natural home of an organism