0 the circular pattern of a gas, such as air, or a liquid, such as magma (= melted rock under the surface of the earth), rising and falling as it becomes hotter and cooler -- 对流圈
The horizontal boundaries of the convection cell are a rhodiumplated copper mirror on the bottom and a sapphire window on the top.
Some early models of plate tectonics envisioned the plates riding on top of convection cells like conveyor belts.
Below this level previously established convection cells would decay.
It asserts that super plumes rise from the deeper mantle and are the drivers or substitutes of the major convection cells.
A convection cell is most notable in the formation of clouds with its release and transportation of energy.
Mixing turned out to be very slow on the scale of the apparatus, since steady convection cells have closed streamlines : without some lateral dispersion it could have taken years !
Heat is dissipated effectively through the former by the formation of hydrothermal convection cells.
Under experimental conditions, granular convection of variously sized particles has been observed forming convection cells similar to fluid motion.
