benchmark review

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