The earth’s crust is broken into plates. These plates are continuously moving because of movement in the mantle below. As the lower mantle touches the upper part of the outer core, heat is transferred from the inner core to the lower mantle. This causes movement in the mantle, which in turn causes the crust to move. layers." What type of heat transfer is occurring as the lower mantle is heated by the outer core? c plate labeled C in the diagram is the