benchmark reveiw

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Across
  1. 3. water above ground
  2. 5. water under earths surface
  3. 6. when waste causes water to be harmful
  4. 7. many small sources of pollution
  5. 13. growth of towns due to people moving to urban
  6. 15. harmful chemicals are added to water
  7. 16. rock or sediment that can store water
Down
  1. 1. one specific site of pollution
  2. 2. dead or live animal are in the water
  3. 4. removing harmful bacteria & micros in water
  4. 8. seawaters that seep into aquifers
  5. 9. a body of water [behind a dam]
  6. 10. more nutrients in the water
  7. 11. water that is okay to drink
  8. 12. frozen layer of soil
  9. 14. heating of natural water from humans