No. The lithosphere is the upper mantle and the crust. The upper mantle is cooler than the lower mantle, and is pretty solid. It's attached to the underside of the crust. read more
The solid, rigid mantle above the asthenosphere, plus the crust above that, is what makes the lithosphere. Thus the crust is part of the lithosphere, but not the same exact thing. The lithosphere is crust plus the uppermost part of the mantle. read more
Lithosphere vs Crust . The difference between lithosphere and crust finds its base in the formation of the earth. Earth, which is a spheroid, is not a monolithic, uniform structure, but divided into layers having different characteristics. Starting from the center of the earth, it is the core that is encountered first (3400km radius). read more
The lithosphere is the rigid layer that tectonic plates are made up of. It consists of the crust (both continental and oceanic) AND part of the upper mantle. It is true that the composition of the crust contains more silica, however the mantle portion of the lithosphere has the same composition as the asthenosphere. read more