Water Quality

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Across
  1. 1. a scale used to specify the acidity or basicity of an aqueous solution
  2. 3. pollution pollution that comes from many places,
  3. 6. the amount of cloudiness in the water.
  4. 7. compounds that involve nitrogen and oxygen molecules
  5. 9. the amount of oxygen that is present in water.
Down
  1. 1. safe drinking water
  2. 2. an organism whose status in an ecosystem is analyzed as an indication of the ecosystem's heath
  3. 4. that improves the quality of water
  4. 5. richness of nutrients in a lake or other body of water
  5. 8. aking care of something