Benchmark Review

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Across
  1. 4. Growth of towns and cities due to people moving
  2. 5. Waste causes water to become harmful
  3. 6. A body of water that usually forms behind a dam
  4. 8. When harmful chemicals are added to water
  5. 9. Removing harmful bacteria and microbes from water
  6. 10. Water under Earths surface
  7. 11. Many small sources of pollution
  8. 14. A body of rock or sediment that can store water
  9. 15. Any heating activities of natural water
Down
  1. 1. Frozen layer of soil in polar regions
  2. 2. When live or dead organisms are added to water
  3. 3. Contaminating water supplies
  4. 7. One specific site of pollution
  5. 12. Water that is suitable to drink
  6. 13. Body of water above the ground
  7. 16. An increase in the amount of nutrients in water