Water Pollution

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Across
  1. 2. Place to discharge sewage
  2. 4. Used water
  3. 6. Easy to identify , monitor and regulate
  4. 7. Second largest source of water pollution
  5. 9. Thermal power generation
  6. 11. specialized process
  7. 12. Stragety to deal with pollution
  8. 13. Disease-causing bacteria
  9. 14. Nutrients in body of water
  10. 15. Soil erosion causes soil particles to be carried into waterways
  11. 16. Difficult and expensive to identify and control
  12. 18. Fertilizer runoff from farmland adds nitrogen and phosphorus to waterways
  13. 19. Physical/mechanical process
  14. 20. Areas where water cannot survive
Down
  1. 1. Harmful changes in water quality
  2. 3. Most effective and least costly
  3. 5. Leading cause of water pollution
  4. 8. Used before discharge
  5. 10. Biological process
  6. 17. Third largest source of water pollution