Water Pollution

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Across
  1. 2. main cause of oil pollution in the oceans → Spills (6 letters)
  2. 4. inputs of nutrients leads to high levels of nutrients → Eutrophication (14 letters)
  3. 6. that attach through rain/snow → Atmosphericdeposition (20 letters)
  4. 7. connected to house wastewater → Septictank (10 letters)
  5. 8. used on cargo ships to prevent spills → Doublehull (10 letters)
  6. 9. water pollution (temperature) → Thermalshock (12 letters, same as Across 9)
  7. 11. that occurs in a diffuse area → Nonpointsource (14 letters)
  8. 13. used to detect pathogens → Indicatorspecies (16 letters)
  9. 15. depleted of oxygen → Deadzones (9 letters)
  10. 19. of water → Waterpollution (14 letters)
  11. 20. metal from pipes → Lead (4 letters)
  12. 22. to the bottom of septic tanks → Sludge (6 letters)
Down
  1. 1. indicating pollution level → Turbidity (9 letters)
  2. 2. manufacture in the U.S ended in 1979 → PCBs (4 letters)
  3. 3. organisms that pose a threat to crops and health → Pesticides (10 letters)
  4. 5. that kills organisms by drastically changing the water temperature → Thermalshock (12 letters)
  5. 8. fairly clear middle water layer → Thermocline (11 letters)
  6. 10. soil near rockets → Perchlorates (12 letters)
  7. 12. of pipes and lawns (septic system) → Drainfield (10 letters)
  8. 14. sewage system → SepticSystem (12 letters)
  9. 16. from a distinct location → Pointsource (11 letters)
  10. 17. & human waste pollution → Nutrientpollution (16 letters)
  11. 18. nitrogen/phosphorus phenomenon → Eutrophication (14 letters, same as Across 7)
  12. 21. indicator species → Fecalcoliform (13 letters)