Watershed crossword puzzle

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Across
  1. 2. source pollution water pollution that comes from a single, discrete place
  2. 4. species an organism that is not native and has negative effects on our economy, our environment, or our health
  3. 5. acidification reduction in the pH of the ocean over an extended period time
  4. 7. excessive richness of nutrients in a lake or other body of water
  5. 9. cloudiness or haziness of a fluid caused by large numbers of individual particles
  6. 11. surface artificial structures such as pavements
  7. 15. a river or stream flowing into a larger river or lake
  8. 16. Peninsula a large peninsula on the East Coast of the United States
  9. 18. the tidal mouth of a large river, where the tide meets the stream
Down
  1. 1. organism's specific role in an ecosystem
  2. 3. source pollution both water and air pollution from diffuse sources
  3. 6. water held underground in the soil or in pores and crevices in rock
  4. 7. species a species of animal or plant that is seriously at risk of extinction
  5. 8. the process by which water on the ground surface enters the soil
  6. 10. deposited as a layer of solid particles on the bed or bottom of a body of water or other liquid
  7. 12. aquatic vegetation sea grasses, water plants and algae
  8. 13. mix of salt and fresh water
  9. 14. sinks a forest, ocean, or other natural environment viewed in terms of its ability to absorb carbon dioxide from the atmosphere
  10. 17. dynamics branch of complex systems research in statistical physics
  11. 19. the draining away of water (or substances carried in it) from the surface of an area of land, a building or structure