water

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Across
  1. 4. bodies of shallow water
  2. 6. something that is not enough or difficult to find
  3. 7. large pieces of land covered with grass on which animals can feed
  4. 8. falling down of water
Down
  1. 1. pollute or make something dirty or impure
  2. 2. to keep something safe from harm and danger
  3. 3. treating the used water and making it available for further use
  4. 5. only planet that has water