Whole-Mantle convection other researchers favor some type of whole-mantle convection in which cold oceanic lithosphere One great depths and stirs the entire mantle(Figure 7.35B) whole-mantle model suggests that the burial ground for subducting slabs is the core-mantle boundary. Over time, this material melts and buoyantly rises toward the surface as a mantle plume, thereby transporting hot material toward the surface(Figure 7.35B)