Across
- 3. Salt concentration in water
- 5. Tentacled ocean creature with ink defense
- 8. Marine plants that perform photosynthesis
- 10. Small fish-like creature eaten by whales
- 14. Floating microscopic plants
- 15. Community of organisms and their environment
- 18. Marine animal with five arms
- 19. Small crustacean that attaches to rocks and ships
- 20. Underwater structure formed by coral
Down
- 1. Order including whales and dolphins
- 2. Hard, colorful marine animals that build reefs
- 4. Symbiotic sea creature with stinging tentacles
- 6. Tiny drifting organisms forming the marine food chain
- 7. Transparent, stinging marine animal
- 9. Coastal trees growing in saltwater
- 11. Intelligent marine mammal with echolocation
- 12. Where freshwater meets saltwater
- 13. Sea animal with horse-like head
- 16. Whale species with a long spiral tusk
- 17. Rise and fall of sea levels