Water Pollution Crossword

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Across
  1. 4. a physical/mechanical process
  2. 5. any change in quality of water that damages the environment
  3. 7. second largest source of water pollution
  4. 9. a biological process
  5. 12. accidental spillage from nuclear power stations
  6. 14. the leading cause of water pollution
  7. 15. discharge pollutants into bodies of surface water at specific locations through drain pipes, ditches or sewer line
Down
  1. 1. released heated water into river systems
  2. 2. before discharge
  3. 3. soil erosion causes soil particles to be carried into waterways
  4. 6. reaches ocean from natural seeps on the ocean bottom and human activities
  5. 8. fertilizer runoff from farmlands adds nitrogen and phosphorus to waterways
  6. 10. specialized chemical and physical processes
  7. 11. cumulative arising from multiple inputs over large areas, such as farms, city streets and residential neighborhoods
  8. 13. third largest source of water pollution