Water Pollution

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Across
  1. 1. to protect something (noun)
  2. 5. to protect something (verb)
  3. 6. Something that can be decomposed naturally
  4. 8. A flowing body of freshwater
  5. 9. Something that cannot be decomposed naturally
Down
  1. 2. A large body of salt water
  2. 3. Water that has been used
  3. 4. Material that is non-biodegradable
  4. 7. Water that flows over the ground after it rains