[[File:Mantle_convection_cell.jpg|framed|center|Mantle Convection <ref> http://research.bpcrc.osu.edu/education/rr/plate_tectonics/mantle_convection_cell.gif </ref>]] | [[File:Mantle_convection_cell.jpg|framed|center|Mantle Convection <ref> http://research.bpcrc.osu.edu/education/rr/plate_tectonics/mantle_convection_cell.gif </ref>]] |