Ocean currents are large-scale movements of water in the ocean, driven by factors like wind, temperature, and salinity differences. These currents can flow for thousands of miles and play a crucial role in regulating the Earth's climate. For example, the Gulf Stream carries warm water from the Gulf of Mexico up the eastern coast of the United States, influencing weather patterns and temperatures. There are two main types of ocean currents: surface currents and deep-water currents. Surface currents are primarily caused by wind and affect the upper layer of the ocean, while deep-water currents are driven by differences in water density. Together, these currents help distribute heat and nutrients throughout the ocean, supporting marine life.