movement caused by the rising of less dense, hotter materials and the concurrent sinking of more dense, cooler materials.
The process in which a hot liquid moves away from the heat source, since hot liquid is lighter than cold liquid. The cold liquid far from the heat source moves to it since it's heavier than hot liquid. This is a continous cycle, as long as a heat source exsists. (See : PLATE TECTONICS)
Rising or sinking air currents that stir the atmosphere and transport heat from one area to another. Convection currents also occur in water; see spring overturn.