Water pollution

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Across
  1. 3. of elements finished into the water And make it not drinkable
  2. 5. is essential to live
  3. 7. can be if that finished into us
Down
  1. 1. This environmental issus
  2. 2. throw away the
  3. 4. This element is contaminanted we talk
  4. 6. element is for the car