Oceanography

6. Organisms that live near the seabed.
7. Opening in the sea floor of which heated water flows.
10. Found in ocean trenches and is deepest layer of ocean.
12. Steep slope where the continental shelf drops to the deep ocean floor.
14. Deep and narrow opening in the ocean floor very often caused by tectonic activity.
16. Aquatic animals that can navigate independently of water currents.
17. Uppermost layer of the ocean where the sunlight still penetrates.
18. A flat level of the deep-ocean basin.
19. Underwater mountain range formed by plate tectonics.
20. Middle layer of the ocean receiving little light.

1. Underwater mountain rising from ocean floor that doesn't reach the surface.
2. Ocean layer in which no sunlight reaches.
3. Microscopic organisms floating or moving in the sea.
4. Extended perimeter of each continent. Lies submerged under relatively shallow seas.
5. Concentration of salt in water.
8. Layer of the ocean that's 4,000 and 6,000 meters in depth.
9. Series of ocean waves with really long wavelengths caused by large-scale disturbances.
11. Rising of cold water from deep in the ocean to the surface.
13. Layer in body of water where the temperature changes rapidly the deeper it goes.
15. Diverse underwater ecosystem held by calcium carbonate structures secreted by corals.