Across
- 1. gray-brown haze formed by chemical reaction
- 3. harmful material
- 7. Ecosystem good the can be replaced
- 8. airborne acids that fall from clouds
- 9. farming, overgrazing, and climate change
Down
- 2. the practice of clearing for single crop use
- 4. Fossil fuels
- 5. pollutant picked up by organism
- 6. loss of forest