Water..water..everywhere water..

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Across
  1. 1. Example of a waterborne disease.
  2. 4. partially frozen snow
  3. 5. This economy sector needs the most amount of water.
  4. 7. Process that removes salt from water
Down
  1. 2. Leakage of petroleum onto the surface of a large body of water.
  2. 3. main source of water pollution in the kitchen
  3. 6. A prolonged period of low rainfall leading to shortage of water