The Role of Convection in Physical Processes

Warm air at warm water becomes less dense. So it expands as it expands, it's lighter than the cooler water or the cooler air. And so you can see if hot water is moving one way and cold water is moving in to fill its place,. You've got the beginnings of a sort of a rotation there. Convection cells inside the earth's mantle are also responsible for volcanic activity, tectonic plates which move around the continents.