The Best Crossword Puzzle Ever

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Across
  1. 4. contaminent
  2. 7. aluminum
  3. 8. global warming
  4. 10. tradition
  5. 12. mixture
  6. 13. left
  7. 14. under
  8. 15. behind
  9. 16. right
  10. 18. carbon dioxide
  11. 19. on top of
  12. 20. scorn or contempt
Down
  1. 1. landfill
  2. 2. greenhouse effect
  3. 3. salad bowl
  4. 5. to cooperate
  5. 6. multiculturalism
  6. 9. mosaic
  7. 11. environment
  8. 17. native inhabitant