Across
- 6. The open-water part of the ocean where organisms live away from the bottom.
- 7. The shallow, gently sloping underwater edge of a continent.
- 9. The seafloor and the sediments on it, where bottom-dwelling organisms live.
- 11. The total amount of dissolved salts in seawater, usually given as grams of salt per kilogram of water.
- 12. An underwater volcanic mountain that rises at least 1,000 m above the seafloor but does not reach the surface.
Down
- 1. A distinct layer in the ocean where temperature decreases rapidly with increasing depth.
- 2. Long underwater mountain chains formed by volcanic activity in the middle of ocean basins.
- 3. The single, interconnected body of seawater that covers most of Earth, including all five oceans.
- 4. Narrow, extremely deep underwater canyons, like the Mariana Trench.
- 5. The long-term decrease in ocean pH caused by absorption of extra carbon dioxide from the atmosphere.
- 8. Very deep, flat areas of the ocean floor at about 3–5 km depth.
- 10. A huge, roughly circular system of wind-driven surface currents that circulates around an ocean basin.