water

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Across
  1. 2. treatment the process of removing potentially dangerous substances from water to make it more acceptable for a desired end-use
  2. 3. chemicals like chlorine kill germs
  3. 5. (from oceans) is too salty to drink without special treatment
  4. 7. removes small particles
  5. 8. clean water is stored until needed
  6. 9. heavy particles settle to the bottom
Down
  1. 1. an area surrounded by high land and drained by a river and its tributaries; all runoff from within the watershed leaves the watershed at the same exit
  2. 4. (from rivers, lakes, and groundwater) is used for drinking and farming
  3. 6. Added to drinking water to kill unwanted organisms