Question
Explain how convection causes trade winds.
Solution
The surface of the earth at the equator is heated more by sun rays than poles. The hot air at equator moves up and sets the region of low pressure at the equator. This pressure gradient between poles and equator causes the cold air to move from poles to the equator. Due to rotation of the earth from west to east, the wind from northern hemispheres appears to come from the northwest and that from southern hemispheres appears to come from the south-west.
