Urban problems

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Across
  1. 3. It’s the introduction of bad substances into the environment with negative effects for people, plants and animals.
  2. 7. It’s another word for “area”.
  3. 8. It’s what sidewalks and buildings are made of.
  4. 10. That’s the cars moving on the roads.
Down
  1. 1. It’s what old cars, motorcycles and factories produce.
  2. 2. It’s annoying sounds made by people, cars, animals, etc.
  3. 4. It’s when the cars don’t move in the street.
  4. 5. It’s the part of the planet that’s not covered by water.
  5. 6. It’s a painting or writing found outside public buildings and houses.
  6. 9. It’s what we breathe.
  7. 10. It’s what we don’t want anymore and we throw away.