The mechanism of heat transfer in the atmosphere is convection. Which statement is true about convection?


A. Convection occurs in all forms of material.

B. Convection is the transfer of heat energy through a vacuum or any transparent media in the form of electromagnetic waves.

C. Convection is the transfer of heat energy through a substance without the substance moving.

D. Convection is the transfer of heat energy from one place to another by the movement of the substance itself.