Across
- 3. — Small crustacean living in water
- 4. — Amphibian living near water
- 8. — Hard protective covering of marine animals
- 10. — Island group north of Sicily
- 14. — Saltwater covering most of the Earth
- 16. — The sea itself
- 17. — Soft-bodied sea animal
- 19. — Aquatic plant-like organisms
- 20. — Reef-building marine organism
Down
- 1. — Movement on the surface of water
- 2. — Intelligent marine mammal
- 5. - A marine mammal known for its size
- 6. — Microscopic aquatic organisms
- 7. — Predatory fish
- 8. — Soft marine animal
- 9. — Large migratory fish common in the Mediterranean
- 11. — Frozen water
- 12. — Large body of salt water
- 13. — Coastal inlet
- 15. — Flowing natural watercourse
- 18. — A still body of freshwater