"Oceanography Vocab": HTML5 Crossword

Across

3. The middle layer of the ocean receiving very little light. (11,4)
4. The uppermost layer of the ocean where sunlight penetrates. (10,4)
5. The deepest layer of the ocean found in ocean trenches. (12,4)
8. The extended perimeter of each continent which lies submerged under relatively shallow seas. (11,5)
11. Aquatic animals that can swim and move independently of water currents. (6)
13. An opening in the sea floor out of which heated mineral-rich water flows. (12,4)
14. The concentration of salts in water. (8)
15. An underwater mountain rising from the ocean floor that does not reach the surface. (8)
17. The deep ocean layer where no sunlight reaches. (12,4)
18. A series of ocean waves with extremely long wavelengths caused by large-scale disturbances. (7)
19. A deep narrow depression in the ocean floor often caused by tectonic activity. (6)

Down

1. The steep slope where the continental shelf drops to the deep ocean floor. (11,5)
2. The rising of cold nutrient-rich water from deep in the ocean to the surface. (9)
6. A flat almost level area of the deep-ocean basin. (7,5)
7. Organisms that live on in or near the seabed. (7)
9. The layer of the ocean at depths between 4000 and 6000 meters. (13,4)
10. A diverse underwater ecosystem held together by calcium carbonate structures secreted by corals. (5,4)
12. A layer in a body of water where the temperature changes rapidly with depth. (11)
16. Small and microscopic organisms drifting or floating in the sea. (8)