Secrets of the Deep

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