1. Uneven heating takes place on the surface of the earth.
2. We know that regions close to the equator gets more heat from the sun.
3. This is because of the direction of the sunlight being straighter close to the equator.
4. The air in these regions gets warmer.
5. The warm air rises, and the cooler air from the regions in the 0 – 30° latitude belt on either side of the equator moves in.
6. This movement of air sets forth winds that move over the earth.
7. We have also seen that the increased wind speed is accompanied by a reduced air pressure and this aids rains.
