Water pollution

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Across
  1. 5. water treatment step where bacteria break down solids
  2. 7. parasitic worms or bacteria in water
  3. 8. source of water pollution that enters water from a confined, easily identifiable place
  4. 12. “used” water; sent to a treatment plant in developed countries
  5. 13. type of pollution caused by fertilizers, animal waste, or soaps
Down
  1. 1. solids that form at the bottom of tanks during water treatment
  2. 2. source of water pollution that comes from widespread areas
  3. 3. law that protects drinking water from pollution sources
  4. 4. type of pollution caused by oil spills or pesticides in water
  5. 6. higher concentration of pollutants at each new level of a food chain
  6. 8. water treatment step where large things are removed with a screen
  7. 9. type of pollution caused by hot water, usually from power plants
  8. 10. law that protects surface water from pollution sources
  9. 11. solid particles like dirt or sand etc getting into water