The marine environment

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