Across
- 3. - A sea creature with a hard shell and two pincers.
- 5. - A sea animal with a long body, tentacles and the ability to release ink.
- 6. - A shellfish that can sometimes produce a pearl.
- 11. - The regular rise and fall of the ocean's water level.
- 12. - A hard outer covering that protects certain sea animals.
- 14. - A type of large seaweed that grows underwater.
- 16. - A ridge of rock or coral found beneath the surface of the sea.
- 18. - A sea animal with eight arms and the ability to squirt ink.
- 19. - A marine animal with a hard shell, long antennae and claws.
- 20. - A large fish with sharp teeth that lives in the ocean.
Down
- 1. - Tiny organisms that drift through the water and provide food for many marine animals.
- 2. - A vessel designed to travel underwater.
- 4. - A reptile with a hard shell that can live in the ocean.
- 7. - A soft-bodied sea animal with tentacles that can sting.
- 8. - The continuous movement of ocean water in a particular direction.
- 9. - A sea animal usually recognised by its five arms.
- 10. - A huge marine mammal that breathes air through its blowhole.
- 13. - A small sea creature with a horse-shaped head.
- 15. - An intelligent marine mammal that breathes air through a blowhole.
- 17. - A tiny sea animal that builds hard structures and forms reefs.