Water Pollution Crossword

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Across
  1. 4. fresh water found below Earth's surface
  2. 5. found on Earth's surface
  3. 7. a synthetic organic compound used as an insecticide.
  4. 8. a network of connected streams and rivers
  5. 11. contamination of water bodies, usually as a result of human activities
  6. 12. the process of removing salt from sea water
Down
  1. 1. an area where surface water soaks into the ground and reaches an aquifer
  2. 2. pollution that comes from a specific location
  3. 3. all of the land area that supplies water to a particular river system
  4. 6. a method of waste-water disposal
  5. 9. nitrogen-containing compound that can exist in the atmosphere or as a dissolved gas in water
  6. 10. the rapid growth of algae in an area