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What causes ocean currents? Ocean currents result from two processes - the action of wind on the surface of the water, and from variation in water temperature that causes movement- a process known as convection. Convection occurs because the oceanic waters heat up becoming less dense. This water moves above the cooler water, and give off its heat to the surrounding environment. As it cools, it begins to sink, and the process begins again. Convection results in the continual circulation of ocean water on a global scale.
Some ocean currents are caused by differences in the density of water from place to place around the globe. What two factors cause differences in ocean water density? A) differences in water temperature and wind B) differences in water temperature and phases of the moon C) differences in the amount of dissolved salts and gravity D) differences in water temperature and amount of dissolved salts