In this embodiment , the expansion of inner mantle layer 2104 and the compression of outer mantle layer 2104 may cause opposing forces at boundary 2010 .
Internal stress may be caused by opposing forces at boundary 2010 .
In this embodiment , the expansion of inner mantle layer 2104 and the compression of outer mantle layer 2104 may cause opposing forces at boundary 2010 .
Internal stress may be caused by opposing forces at boundary 2010 .