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