Bemchmark Review!

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