What is the term for the circular movement of material inside Earths mantle?

A. Density

B. Convection

C. Conservation

D. Equilibrium

It is convection because there is a convection current in which hot air rises and cools through different temperature

The correct option is B.

Convection is the process by which heat is transfer in fluids as a result of bulk movement of molecules. Mantle convection refers to the slow movement of the earth solid material which is caused by the convection current which brings heat from the interior of the earth to the earth surface.