The lithosphere.
convection currents
The soft layer of the mantle on which the tectonic plates move is called the asthenosphere. It is a semi-fluid layer beneath the lithosphere that allows for the movement of the tectonic plates due to convection currents in the mantle.
The layer of tar-like mantle under the tectonic plates is called the asthenosphere. It is a partially molten and ductile region of the Earth's mantle that allows the lithospheric plates to move on top of it.
The upper mantle contains convection currents that move the tectonic plates.
Mantle convection causes the tectonic plates of the Earth to move slowly. Mantle convection is when heat moves from the mantle to the surface and causes the mantle, and the tectonic plates to move very slowly.
No, convection currents in the upper mantle cause tectonic plates to move.
asthenosphere
Tectonic plates move because they are floating on top of the liquid mantle.
The upper layer. It is filled with melted liquid.
No, convection currents in the mantle are the primary driving force behind the movement of tectonic plates. These currents are generated by heat from the Earth's core, causing movement in the mantle that in turn drags and moves the overlying tectonic plates.
You may be looking for the term continental drift, but a more accurate answer to your question is that tectonic plates can move because they float on the underlying magma, so the process that allows them to move is simply floating.
The movement of tectonic plates is primarily driven by the energy released from the Earth's internal heat, known as geothermal energy. This energy causes convection currents in the mantle, which in turn exerts forces on the tectonic plates, causing them to move.