Do you have reason to suspect that they should become isolated on the same dilution plate

there's the proffessional site that will you.

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.

if you know your abc's you should be able to get your answer or just use google