Question

how wind current is generated

Answer 1

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here is your answer,

Surface currents are generated largely by wind. Their patterns are determined by wind direction, Coriolis forces from the Earth's rotation, and the position of land-forms that interact with the currents. ... Currents may also be generated by density differences in water masses caused by temperature and salinity variations.

Answer 2

Temperature differences can cause air currents because warmer air is less dense than cooler air, causing the warmer air to appear "lighter." Thus, if the warm air is under the cool air, air currents will form as they exchange places. Air currents are caused because of the "uneven heating of Earth's surface."