The lithospheric mantle is the portion of the

lithosphere A lithosphere () is the rigid, outermost rocky shell of a terrestrial planet or natural satellite. On Earth, it is composed of the crust and the lithospheric mantle, the topmost portion of the upper mantle that behaves elastically on time ...

within the mantle, as opposed to the crust. It is solid, and is the uppermost part of the mantle. The lithospheric mantle is subdivided into the subcontinental lithospheric mantle (associated with the continental lithosphere) and oceanic lithospheric mantle (associated with the oceanic lithosphere).

References

Earth's mantle {{geology-stub