Across
- 3. Microscopic organisms drifting in water currents.
- 4. Deepest regions of the ocean floor.
- 8. Tiny crustaceans vital to marine food chains.
- 11. Whale or dolphin classification.
- 12. Steep underwater canyon.
- 13. Simple aquatic plant-like organisms.
Down
- 1. Marine polyps forming reefs.
- 2. Underwater vent releasing heated water.
- 3. Relating to open sea waters.
- 5. Measure of ocean water's salt content.
- 6. Relating to shallow marine zones.
- 7. Periodic sea level changes due to gravity.
- 9. Highly saline seawater.
- 10. Ring-shaped coral island encircling a lagoon.
- 13. Cluster of islands.