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