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Ocean currents are continuous, directional movement of ocean water generated by a combination of factors including wind, temperature, salinity, and the Earth's rotation. These currents play a crucial role in regulating the Earth's climate by distributing heat around the globe and influencing weather patterns. They can be classified as surface currents, which occur in the top 400 meters of the ocean and are primarily driven by wind, or deep ocean currents, which flow beneath the surface and are driven by differences in water density. Ocean currents can vary in speed, size, and direction, with some currents traveling thousands of miles and impacting marine life, ecosystems, and human activities such as shipping and fishing.