Water Quality

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Across
  1. 3. group 1 metals
  2. 5. a range used to express the amount of hydrogen ions in a solution.
  3. 7. the amount of oxygen in the water.
  4. 8. pollution that does not have specific point of origin.
  5. 10. an organism that is sensitive to environmental conditions.
  6. 12. looking after something.
Down
  1. 1. drinkable.
  2. 2. a measure of how clear the water is.
  3. 4. excessive growth of nutrients in a body of water.
  4. 5. pollution that comes from a specific site.
  5. 6. waste that is washed down sinks, tubs and showers.
  6. 9. nitrogen compounds used for growth by plants and algae.
  7. 11. process of purifying water.