Question

how are wind currents caused due to uneven heating of the earth

Answer 1

The Wind is caused by air moving from areas of high pressure to areas of low pressure. It is produced by the uneven heating of the earth's surface by the Sun. Some parts of the earth are warm and some, cold. Warm air, which weighs less than cold air, rises.

Answer 2

When the surface gets hotter intentionally the atmosphere gets cooler then the air moves from hot condition to cool conditions then again when the surface gets cooler and atmosphere gets hotter then again the air blows from hot conditions to cool conditions and vise versa and hence wind currents are generated.