Convection is the transfer of heat through the rising and sinking of a fluid. A student is constructing an explanation for how convection currents form in the mantle. which statement would be most useful for the student to include in the explanation? A. The mantle contains gases mixed with rock.

B. earths temperature increase with depth

C. temperatures are about the same throughout the mantle

D. The mantle is the thickest of earths four main layers