Which two processess do scientists think move the earth's lithospheric plates?
a.
gravity acting on the edges of plates and friction between the plate and the asthenosphere
b.
friction between the plate and the asthenosphere and pressure of magma on the edge of the plate
c.
gravity acting on the edges of plates and convection in the mantle
d.
convection in the mantle and pressure of magma on the edge of the plate