Water pollution

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Across
  1. 2. Underground layers of premeable rock, sand, or gravel
  2. 4. The process of making something dirty or poisonuos
  3. 6. Natural streams of freshwater flowing in a channel
  4. 7. A large, inland body of still water
Down
  1. 1. Fresh water held underground in soil pore spaces and rock fractures
  2. 3. A liquid
  3. 5. The vast interconnected saltwater bodies covering 71% of earth