benchmark review

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Across
  1. 3. removing harmful bacteria and microbes from water
  2. 4. a body of rock or sediment that can store a lot of water
  3. 7. when waste or other material causes water to become harmful to organisms
  4. 8. growth of town and cities due to people moving from rural to urban area
  5. 9. water under earths surface in space in rock or soil; can be liquid or frozen
  6. 10. occurs when live or dead organisms are added to water supplies
  7. 11. overuse of groundwater causes seawater to sleep in aquifers,contaminating water supplies
  8. 12. one specific site of pollution
  9. 13. an increase in the amount of nutrients in water
  10. 14. any heating of natural water that results from human activity
Down
  1. 1. when harmful chemicals are added to water supplies
  2. 2. water that is suitable to drink
  3. 5. body of water above the ground
  4. 6. many small sources of pollution
  5. 12. frozen layer of soil in polar regions
  6. 15. a body of water that usually forms behind a dam