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Across
  1. 1. pollution
  2. 3. place or arrange (things) in a straight line
  3. 6. a small bubble on the skin caused by damage
  4. 7. prevent
  5. 8. make (something bad) less severe, serious, or painful
  6. 10. prevent from happening; make impossible
  7. 13. fit to be eaten
  8. 14. having a gently calming effect
Down
  1. 2. slogan
  2. 4. strange
  3. 5. a small amount of something that remains after the main part has gone/used
  4. 9. a widely held but irrational belief in supernatural influences, especially as leading to good or bad luck, or a practice based on such a belief.
  5. 11. the state or quality of being complicated
  6. 12. food, especially dried hay or straw, for cattle and other livestock