Question: how is wind created

Monique Henson answered on 16 Nov 2015:

Wind is caused by differences in pressure in the air. If you have some high pressure air next to some low pressure air, then the high pressure air will move into the low pressure area until they both have the same pressure. This movement of air is what we think of as wind.

Differences in air pressure is often caused by heating. For example, on a hot day, the Sun warms up the ground, which in turn warms up air near the ground. However, it’s much harder to warm up the sea, so the air near the sea tends to be a cooler. The difference in temperature between the air near the sea and the air near the land creates a difference in pressure, which then causes wind.

A similar thing happens on really large scales. The equator of the Earth is much warmer than the poles, which means there’s a temperature difference between them. This means that the air at the equator is at a lower pressure than the air at the poles. This creates global winds, as the air at the poles tries to replace the air at the equator. There’s a more in detail explanation of this here.