Benchmark Review

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Across
  1. 4. material that makes water harmful
  2. 7. water above ground
  3. 9. many small sources of pollution
  4. 14. overuse of groundwater causes saltwater to seep into aquifers
  5. 16. frozen layer of soil in polar regions
Down
  1. 1. water behind a dam
  2. 2. body of rock or sediment that can store a lot of water
  3. 3. live or dead organisms added to water
  4. 5. one specific site of pollution
  5. 6. nutrients in water increases
  6. 8. removing harmful bacteria from water
  7. 10. heating of natural water results from human activities
  8. 11. harmful chemicals added to water
  9. 12. water below the ground
  10. 13. growth of towns and cities due to people moving from an urban area
  11. 15. drinkable water