What is earth's lithosphere made of?
The solid crust that includes part of the mantle beneath is called lithosphere. Ocean-above lithosphere might extend to about 60 miles down. Continental lithosphere' might be about 125 miles deep.
Brittle and viscosity characteristics determine the thickness of lithosphere shell. The mechanically rigid/sedimentary outer (above mantle) layer of lithosphere is broken into tectonic plates, with transforming boundaries.