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