Heat in the core causes magma to blank in columns in the mantle. The hot magma columns move the blank and then when the magma cools it blank back towards the core

Answer 1

Heat in the core causes magma to rise in columns in the mantle. The hot magma columns move the tectonic plates, and then when the magma cools it sinks back towards the core.

The process described is a part of mantle convection, which is a key mechanism driving plate tectonics.