Water cross word

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Across
  1. 4. addition of harmful substance to environment.
  2. 6. measure of the cloudiness or haziness of a fluid.
  3. 8. precipitation that flows over the ground and impervious surfaces.
  4. 10. Underground layer of rock that holds Groundwater.
  5. 11. The compacting and sinking of land.
  6. 12. Lets water pass through it.
Down
  1. 1. area of water with low oxygen.
  2. 2. Only 3% of the water on earth is ___.
  3. 3. covers 71% of earth.
  4. 5. 97% of all water on earth is ___.
  5. 7. Large body of salt water.
  6. 9. animal that filters, provides food, and provides shelter. It is a keystone species.