Water pollution

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Across
  1. 2. To make water, air, soil, etc dirty or harmful
  2. 4. An accident in which oil has come out of a ship and caused pollution
  3. 6. The number and types of plants and animals that exist in a particular area or in the world generally
Down
  1. 1. A global problem that arises from the exploitation of the ocean as a garbage pit
  2. 3. Water that is safe for people to drink
  3. 5. To pass a liquid or gas through a piece of equipment in order to remove solid pieces or other substances
  4. 7. Things that you throw away because you do not want them