water puzzle

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Across
  1. 3. Non-point source pollution is when the source of pollution either cannot be identified or may come from many sources
  2. 7. trash in water
  3. 9. a substance that pollutes something, especially water or the atmosphere.
  4. 10. the measure of relative clarity of a liquid
Down
  1. 1. the process where too many nutrients, mainly nitrogen and phosphorus, are added to bodies of water and can act like fertilizer, causing excessive growth of algae
  2. 2. made up of fine particles
  3. 4. The reduction in the concentration of dissolved oxygen in water, especially as a result of pollution.
  4. 5. the principle law governing pollution control and water quality of the Nation's waterways
  5. 6. the introduction of harmful materials into the environment
  6. 8. richness of nutrients in a lake or other body of water, frequently due to runoff from the land, which causes a dense growth of plant life and death of animal life from lack of oxygen