Water

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Across
  1. 3. We have to do to water when it is dirty
  2. 4. When we freeze the water
  3. 6. When the water is clean enough to drink it
  4. 7. When something is dirty
Down
  1. 1. The route water follows
  2. 2. When we boil water
  3. 5. You can drink fresh water from it. Usually it’s outside