Save our oceans

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Across
  1. 3. convert (waste) into reusable material, use again.
  2. 5. a colony of very many genetically identical polyps.
  3. 6. a large marine reptile with a bony or leathery shell and flippers.
  4. 8. the first layer of the ocean. It goes down to 200mts.
Down
  1. 1. a substance or thing that has harmful or poisonous effects.
  2. 2. the second layer of the ocean, the last one with any light.
  3. 4. the body of salt water that covers approx. 70.8% of Earth.
  4. 7. the last layer of the ocean.