How does heat transfer work?
answer in your own words.

Heat moves in three ways: Radiation, conduction, and convection. Radiation happens when heat moves as energy waves, called infrared waves, directly from its source to something else. This is how the heat from the Sun gets to Earth. In fact, all hot things radiate heat to cooler things.

heat from the core of the earth causes convection currents to occur in the mantle. these currents slowly move the crust around.