Benchmark Reveiw

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Across
  1. 2. suitable to drink
  2. 4. growth of towns and cities due to people moving
  3. 5. material deposited in water that contaminated
  4. 6. many different sites of pollution
  5. 9. added chemicals to water that contaminate it
  6. 10. removing bacteria from contaminated water
  7. 12. a body of water formed behind a dam
  8. 13. an increase of nutrients in water
  9. 14. a body of rock or sediment that can hold a lot of water
  10. 15. a layer of soil that is frozen
Down
  1. 1. water under earth's surface
  2. 2. one specific site of pollution
  3. 3. organisms added to water that contaminate it
  4. 7. overuse of ground water that causes saltwater to seep in
  5. 8. heating of natural water caused by humans
  6. 11. body of water above the surface