Earth Day crossword

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Across
  1. 6. all living and nonliving things
  2. 7. convert waste into something that can be used
  3. 9. recycle with organic materials
  4. 10. recycle to make a product of higher value
  5. 12. something that will not go away
  6. 14. study of organisms and their environment
  7. 16. 03, chemical in the atmosphere
  8. 17. when a species is wiped out
  9. 18. trash
  10. 19. naturally replenished energy
Down
  1. 1. living matter
  2. 2. to make last as long as possible
  3. 3. layer of gas around the planet
  4. 4. a place where trash is left forever
  5. 5. to add pollution
  6. 6. gas released into the air
  7. 8. interacting organisms in an environment
  8. 11. to save or protect something
  9. 13. sun's energy
  10. 15. where an animal lives