Another example is boiling water. The water at the bottom of a pan is heated by the bottom of the pan. This heated water then rises to the top and is replaced by cooler water flowing from the top to the bottom, the process then repeats itself. This system of rising and falling gases is taking place in the convective zone of the sun. The surface of the sun shows signs of this convection in the form of granulation.
Granulation is seen by the mottled surface of the sun.
The granules can be seen in the figure above. Granulation takes place on a larger scale through the chromosphere. These regions are referred to as super granules. Images may be copyrighted by many different sources. If you have comments about these pages, I would be happy to hear them.