Final answer:
Hot gases rising towards the Sun's surface and cooler gases sinking downward is a process known as convection. Features undergoing this process in the Sun's atmosphere are granules.
Step-by-step explanation:
Hot gases rising towards the Sun's surface and cooler gases sinking downward is a process known as convection.
In convection, warmer material rises while colder material sinks, transferring energy in the process. This phenomenon is observed in the Sun's interior, where rising convection currents carry heat from the core to the surface, and cooler material sinks back down.
Features undergoing this process in the Sun's atmosphere are granules. Granules are columns of hotter gases that rise from below the photosphere, spread out, cool, and then sink down again between the granules. This motion of the granules is a result of convection.
Convection, granules, Sun's atmosphere