Answer:
Convection is a circulation of the heat or thermal energy emitted by a heat source. Heating materials usually causes them to expand; as they become hotter, they also become less dense.
Convection describes the transfer of heat from hot areas of liquids and gases to cooler ones. This causes the heated, less dense material (hot air) to rise and more dense material to fall (cool air) as it’s pulled by gravity
Explanation:
