Benchmark Review

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Across
  1. 4. removing harmful bacteria and microbes from water
  2. 5. overuse of groundwater causes seawater
  3. 7. growth of town due to people moving from rural to urban areas
  4. 9. when waste or other material that causes water to be harmful
  5. 10. water that is suitable to drink
  6. 12. one specific site of pollution
  7. 13. heating of natural water by human activity
  8. 14. water above ground
  9. 15. when harmful chemicals are added to water
  10. 16. frozen layer of soil
Down
  1. 1. increase of nutrients in water
  2. 2. body of water that usually forms behind a dam
  3. 3. when organisms are added to water
  4. 6. a body of rock that stores water
  5. 8. many small sources of pollution
  6. 11. water under earth's surface