Across
- 7. pollution control devices
- 8. fog or smoke with in a haze made from pollution
- 10. a planned fire to strengthen certain trees and plants
- 11. water used in an industrial process
- 12. making step type slopes for farming crops
Down
- 1. the cultivation of a single crop
- 2. a section of the ozone layer that was depleated
- 3. a micro-organism causing disease
- 4. too much grazing causing grassland damage
- 5. the discharge of gas
- 6. planning and managing people
- 9. maximum yield that can be removed over a period of time