Benchmark Review

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Across
  1. 2. Frozen layer of soil in polar regions
  2. 4. Any heating of natural water that results from human activity
  3. 8. A body of rock or sediment that can store a lot of water
  4. 10. When waste or other material causes water to become harmful to organisms
  5. 13. Body of water above the ground
  6. 14. One specific site of pollution
Down
  1. 1. Water under Earths surface in rock or soil
  2. 3. Removing harmful bacteria and microbes from water
  3. 5. Many small sources of pollution
  4. 6. When harmful chemicals are added to water supplies
  5. 7. Overuse of groundwater causes seawater to seep in aquifers , contaminating water supplies
  6. 9. Occurs when live or dead organisms are added to water supplies
  7. 11. A body of water that usually forms behind a dam
  8. 12. Water that is suitable to drink
  9. 15. Growth of towns and cities due to people moving from rural areas to urban area
  10. 16. An increase in the amount of nutrients in water