Answer:
B.) hot air rising and cooler air falling
Explanation:
Thermal convection is one of the forms of heat propagation that occurs in liquids and gases. It is called this because heat transmission occurs through circular convection currents that form because of the different density between fluids.
When we put water in a bowl to heat it in the stove flame, over time we can see bubbles forming at the bottom of the pan. The water at the bottom, heated by contact with the hot bottom of the pan, has increased volume, becomes less dense and rises. At the same time, its place is occupied by the coldest water above it. Thus, circulating currents form within the liquid, called convection currents.
For this reason, we can conclude that a good example of convection is "hot air rising and cooler air falling".
