Water Pollution Crossword Puzzle

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Across
  1. 5. accidental release of large amounts of liquid petrolium hydrocarbon into marine environments
  2. 7. liquid flowing into a system
  3. 9. an aging process where lakes are fertilized with nutrients
  4. 10. introduction of harmful substances to water
  5. 11. chemical used in water treatment facilities
  6. 13. liquid flowing out of a system
  7. 16. water held in the soil by aquifers
Down
  1. 1. a toxic element that accumulates in the food chain through biomagnification
  2. 2. pollution not discharged from a single source
  3. 3. an excessive, rapid abundance of algae
  4. 4. the quality of being opaque with suspended matter
  5. 6. chemicals used to kill insects, weeds, and other animals that harm crops
  6. 8. chemicals that drain into bodies of water from farms or factories
  7. 10. a measure of acidity, with 7 being neutral
  8. 12. established in 1972 to regulate discharges of pollutants into U.S. waters
  9. 14. polution discharged from a singular source
  10. 15. process of particles settling in water