Oceanography Crossword

4. The concentration of salt in the water
7. An underwater mountain range formed from plate tectonics
8. The deepest layer of the ocean, found in ocean trenches
9. An underwater mountain rising from the ocean that does not reach the surface
11. Small aquatic animals that can swim and move independently of currents
14. The layer of the ocean between 4000 to 6000 meters
16. The extended perimeter of each continent which lies submerged under relatively shallow seas
17. The middle layer of the ocean, receiving very little light
18. Organisms that live in, near, or in the seabed
20. A diverse underwater ecosystem held together by calcium carbonate structures secreted by corals

1. A series of ocean waves with extremely long wavelengths due to large-scale disturbances
2. The deep ocean layer where no sunlight reaches
3. An opening in the sea floor in which heated, mineral-rich water flows
5. The uppermost layer of the ocean, where sunlight penetrates
6. Small, microscopic organisms floating in the sea
10. A flat, almost level area of the deep ocean basin
12. A steep slope where the continent drops to the deep ocean floor
13. The rising of cold, nutrient-rich water from the deep ocean to the surface
15. A deep, narrow depression in the ocean floor, often caused by tectonic activity
19. A layer in a of water in which temperature changes rapidly due to depth