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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.
currents and cold deep currents. Changes in the density set these currents in motion. Some ocean currents are set in motion by the wind. Other ocean currents are created by something you canât see or feel. Differences in the density of water can also cause currents to form and move. Density is affected by temperature and salinity.