water pollution

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Across
  1. 2. portable water filter
  2. 3. sewage or liquid that comes from a facility
  3. 6. lasts 1000 years and ends up in rivers
  4. 11. effective and least costly approach
  5. 12. excessive nutrients in a body of water
  6. 13. change in water quality that can harm living organisms
  7. 15. biological process
  8. 16. third largest source of water pollution
Down
  1. 1. uses screens and a grit tank
  2. 4. before discharge
  3. 5. used to extract oil and natural gas
  4. 7. aquatic life cannot survive
  5. 8. waste discharged into waterways
  6. 9. decreasing concentration in a solution
  7. 10. oil as it comes from the ground
  8. 14. disease causing bacteria