pollution

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Across
  1. 3. type of cancer caused by arsenic
  2. 5. one of the main pollutants of air
  3. 6. sediments reduce this process
  4. 10. running large quantities of water through soil to leach out pollutants
  5. 11. bacteria and other micro-organisms are used to clean up the soil in this process
  6. 13. sludge is often.
  7. 14. the material left behind after the treatment of sewage- it is often toxic
  8. 15. a unit for measuring the intensity of sound
  9. 16. where arsenic deposits are often present
  10. 17. most common disinfectant
  11. 19. pesticides and fertilizers cause_______pollution
Down
  1. 1. gas which causes air pollution
  2. 2. waste from nuclear power plants
  3. 4. toxic gas released from automobile emissions
  4. 7. excessive amounts of eroded soil particles carried by flowing water
  5. 8. sewage can be treated with this method
  6. 9. contamination of water by fluoride
  7. 12. acids, salts, heavy metals etc. are _________ chemicals
  8. 16. a poisonous element
  9. 18. pesticide present in bottled water