Water Pollution Crossword

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Across
  1. 2. when a body of water becomes rich in nutrients the phenomenon is called this
  2. 3. one of the waterborne diseases from wastewater
  3. 7. this thing is apart of the secondary treatment in sewage treatment plants that can break down organic material and it’s called this
  4. 11. found in developed cities that receive wastewater from thousands of households instead of one are called
  5. 16. the biggest oil spill off the coast of Alaska that spilled 11 million gallons is called this
  6. 18. this is what is known as a diffuse area that produces pollution, not specific
  7. 19. the layer that must be pumped out from septic systems every 5 to 10 years is what
  8. 20. it comes from burning fossil fuels such as coal and is called what
  9. 21. infants and fetus are most sensitive to this and is found in pipes that water passes through
  10. 22. this serves as an indicator species and is associated with contaminated sewage
  11. 23. something that grows rapidly due to eutrophication
  12. 24. these things digest dead algae and consume most of the oxygen in the water
  13. 25. a reliable indicator for detecting human waste in water and is commonly found in human intestines is called what
Down
  1. 1. this indicates that a body of water is less polluted by wastewater
  2. 4. very little of this creates dead zones where there is very little life
  3. 5. the biggest type of water pollution is this
  4. 6. used as one method to clean up oil spills by creating barriers on the surface is called what
  5. 8. found in a body of water with extremely low oxygen concentration is called what
  6. 9. the thing that's responsible for diseases found in wastewater is called what
  7. 10. if people are not connected to a city sewer system, they probably have this to treat their wastewater
  8. 12. the step that allows solid waste to settle into a sludge layer is called what
  9. 13. humanmade pond that holds large amounts of manure is called this
  10. 14. a heavy metal that can dissolve in groundwater is called this
  11. 15. the name for a distinct location from which pollution is directly produced is this
  12. 17. the metal damages the nervous system the most is called this