What is the main cause of wind?

The primary cause of wind is differences in atmospheric pressure. Wind occurs because air moves from areas of high pressure to areas of low pressure. When the sun heats the Earth, it doesn't do so uniformly; different surfaces absorb heat differently, leading to variations in temperature. These temperature differences result in variations in air pressure, as warmer air is less dense and rises, while cooler air is denser and sinks.

This movement of air is essentially what we feel as wind. The greater the pressure difference between two areas, the stronger the wind will be. While temperature variations do contribute to pressure differences, they are not the direct cause of wind itself. Humidity differences can influence weather conditions and the formation of clouds, but they do not drive wind in the same way that pressure differences do. Similarly, Earth's rotation does play a role in the behavior of wind patterns (such as the Coriolis effect), but it is the pressure gradient that primarily initiates wind movement.