Earth Day Crossword

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Across
  1. 4. Place to dispose waste
  2. 5. Vanished or no longer living
  3. 6. Maintain in original state
  4. 9. Able to be maintained
  5. 10. To protect from harm
  6. 12. Relating to living matter
  7. 13. Convert to reusable material
  8. 16. Decayed material used as plant fertilizer
  9. 17. Envelope of gases surrounding Earth
  10. 18. To contaminate
  11. 19. A branch of Biology
Down
  1. 1. Reuse discarded material or objects
  2. 2. Natural home of an animal or plant
  3. 3. Toxic gas
  4. 4. Trash in a public place
  5. 7. Biological community of interacting organisms
  6. 8. Relating to the sun
  7. 11. Surroundings in which we live
  8. 14. Production and discharge of gas or radiation
  9. 15. Resource not depleted by use like water