environmental issues

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Across
  1. 2. dangerous
  2. 6. what comes out of the car exhaust pipe
  3. 7. a part of the atmosphere
  4. 9. person who feels concerned about the place where he lives
  5. 10. too much water
Down
  1. 1. when the weather is too dry
  2. 3. system maintained at its best
  3. 4. a lack of
  4. 5. something is added to the environment that is harmful or poisonous to living things.
  5. 8. tries to preserve the planet