Where Does the Garbage Go?

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Across
  1. 8. to crush
  2. 10. nothing inside
  3. 11. make waste into something new
  4. 14. to make dirty or contaminate
  5. 15. letting nature turn dead plants into fertilizer
  6. 16. food from animals
  7. 17. collect in one place
  8. 18. use over again
Down
  1. 1. furnace that burns garbage
  2. 2. place where waste is layered and buried
  3. 3. what you eat
  4. 4. all living things are part of this
  5. 5. to put in different groups or places
  6. 6. garbage and trash together
  7. 7. gather things
  8. 9. place to put waste
  9. 12. one on top of another
  10. 13. food from plants