The earth is tilted on its axis and the rays of the sun are falling directly on the equator which produces heat at the equator more than the other region. They fall slanting as we move north or south of the equatorial region. This heat also depends on the revolution of the earth. Differences in atmospheric pressure generate winds. At the Equator, the sun warms the water and land more than it does the rest of the globe. Warm equatorial air rises higher into the atmosphere and migrates toward the poles. This is a low-pressure system. This uneven heating produces global circulation patterns. As the abundance of energy reaching the equator produces hot humid air that raises high into the atmosphere. A low pressure area forms at the surface and a region of clouds forms at altitude.