human impact on resources

12345678910111213141516171819
Across
  1. 2. farming practice along hillsides
  2. 5. moving crops from field to field
  3. 6. ratio of useful work to energy used
  4. 10. removal of trees without adequate replanting
  5. 12. irrigation practice with slow watering
  6. 14. "not in my back yard"
  7. 15. smoke and fog
  8. 16. contamination
  9. 19. restoring land to original form
Down
  1. 1. non-linear growth
  2. 3. O3
  3. 4. hydraulic fracturing
  4. 7. energy that includes, solar, hydro, geo
  5. 8. __________capacity
  6. 9. light element used in batteries
  7. 11. H20 below the surface
  8. 13. control weeds, insects, etc on plants
  9. 17. radioactive element in nuclear energy production
  10. 18. precipitation with pH below 5.0