Across
- 3. Vent An opening in the sea floor out of which heated mineral-rich water flows.
- 4. Plain A flat, almost level area of the deep-ocean basin.
- 7. Zone The deep ocean layer, where no sunlight reaches.
- 12. Slope The steep slope where the continental shelf drops to the deep ocean floor.
- 14. Reef A diverse underwater ecosystem held together by calcium carbonate structures secreted by corals.
- 17. Zone The uppermost layer of the ocean, where sunlight penetrates.
- 18. A layer in a body of water where the temperature changes rapidly with depth.
- 19. A deep, narrow depression in the ocean floor, often caused by tectonic activity.
- 20. An underwater mountain rising from the ocean floor that does not reach the surface.
Down
- 1. Zone The deepest layer of the ocean, found in ocean trenches.
- 2. The rising of cold, nutrient-rich water from deep in the ocean to the surface.
- 5. Zone The layer of the ocean at depths between 4,000 and 6,000 meters.
- 6. Aquatic animals that can swim and move independently of water currents.
- 8. The concentration of salts in water.
- 9. Small and microscopic organisms drifting or floating in the sea.
- 10. A series of ocean waves with extremely long wavelengths caused by large-scale disturbances.
- 11. Zone The middle layer of the ocean, receiving very little light.
- 13. Shelf The extended perimeter of each continent, which lies submerged under relatively shallow seas.
- 15. Ridge An underwater mountain range formed by plate tectonics.
- 16. Organisms that live on, in, or near the seabed.