Water Pollution Crossword Puzzle

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Across
  1. 4. Largest cause of ocean pollution
  2. 6. Biological process
  3. 7. Specialized chemical and physical process
  4. 10. A natural nutrient enrichment of a shallow lake, a coastal area at the mouth of a river or a slow moving stream
  5. 12. Used to extract oil and natural gas from thousands of wells
  6. 13. Viruses leak from these
  7. 14. A lake that is low in nutrients and its water is clear
  8. 15. Oil as it comes out of the ground
Down
  1. 1. Nutrients are added from natural and human sources in the surrounding watersheds
  2. 2. Physical and mechanical process
  3. 3. Any change in water quality that can harm living organisms or make the water unfit for human uses such as drinking, irrigation and recreation
  4. 5. Sewage from agricultural waste
  5. 8. Any water that contains sewage, other wastes, or polluting chemicals from homes and industries
  6. 9. Substance from factories,sewage systems, power plants, underground coal mines and oil wells
  7. 11. Cumulative, arising from multiple inputs over large areas, such as farms, city streets and residential neighborhoods