earth day

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Across
  1. 6. conditions in which an organism lives
  2. 7. converting into usable material
  3. 9. decayed organic matter
  4. 10. way to create a product of high quality
  5. 12. ability to be maintained
  6. 14. branch of biology that deals with the relations of organisms
  7. 16. formed from oxygen with a pungent odor
  8. 17. having no living organisms in a species
  9. 18. trash on the ground
  10. 19. capability of being reused
Down
  1. 1. things derived from living matter
  2. 2. maintain something
  3. 3. gases surrounding earth
  4. 4. a place to dispose of trash
  5. 5. contamination of water and air
  6. 6. production of gas
  7. 8. biological community
  8. 11. protecting an environment
  9. 13. renewable energy
  10. 15. natural home of a plant