Across
- 1. Large natural streams of water.
- 2. Air pollution that looks like fog.
- 4. A machine that generates electricity from wind.
- 6. Plants that give us oxygen.
- 7. Turning old things into something new.
Down
- 1. A dense, tropical forest with heavy rainfall.
- 2. The dirt where plants grow.
- 3. Another word for garbage.
- 4. Poisonous or harmful.
- 5. A group of living organisms.