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Across
  1. 3. Dirty air, water, or land.
  2. 6. not dangerous
  3. 7. Very loud.
  4. 8. Things people throw away.
Down
  1. 1. Something bad that needs to be fixed.
  2. 2. Full of too many people or cars.
  3. 4. A way for people to travel, like buses or trains.
  4. 5. Too many cars on the road.