Final answer:
The lithosphere moves on top of the asthenosphere.
Step-by-step explanation:
The lithosphere moves on top of the asthenosphere. The lithosphere is the rigid outer layer of the Earth that includes the crust and the upper part of the mantle. It is broken into tectonic plates that can move due to the flow of the underlying asthenosphere, which is a partially molten and ductile layer of the mantle.
Learn more about Plate Tectonics