the zone below the lithosphere
The lithosphere of the Earth is composed of the crust and the upper part of the upper mantle, and is broken up into plates. Below the lithosphere is the asthenosphere, which i â¦ s the lower part of the upper mantle and the entire lower mantle.The asthenosphere is a plastic-like substance that flows due to convection.As this substance flows, it causes the plates above it to move around.he boundary between the asthenosphere and the lithosphere is normally below the Moho (which marks the boundary between the crust and the mantle). The exception to this is b â¦ elow mid-ocean ridges where the moho and the lithosphere / asthenosphere boundary are at the same depth. 3 people found this useful.