How are the lithosphere and asthenosphere alike?

The Earth is composed of three parts, the outermost crust (where we live), the mantle and the core (the innermost portion of the planet). Lithosphere is composed of the crust and the uppermost portion of mantle, while the asthenosphere is the layer just underneath the lithosphere. There are certain similarities between the two (lithosphere and asthenosphere). Both these spheres or layers contain similar type of rocks. In fact, the lower portion of the lithosphere is...

The Earth is composed of three parts, the outermost crust (where we live), the mantle and the core (the innermost portion of the planet). Lithosphere is composed of the crust and the uppermost portion of mantle, while the asthenosphere is the layer just underneath the lithosphere. There are certain similarities between the two (lithosphere and asthenosphere). Both these spheres or layers contain similar type of rocks. In fact, the lower portion of the lithosphere is composed of rocks from asthenosphere that solidifies (due to cooling). Both the layers contain solid rocks, although rocks in asthenosphere are plastic in nature. Another similarity is related to seismics. Both the layers allow the primary waves (or body waves) to pass through them. Asthenosphere also helps in the motion of tectonic plates, in fact, these plates float over the asthenosphere.

Hope this helps.