A layer about 100 km thick in the mantle below the lithosphere, known as the asthenosphere, is apparently capable of plastic flow, unlike the rigid lithosphere and the rest of the mantle. The lithosphere in essence floats on the asthenosphere.
A layer about 100 km thick in the mantle belowthe lithosphere, known as the asthenosphere,is apparently capable of plastic flow, unlikethe rigid lithosphere and the rest of themantle. The lithosphere in essence floats on theasthenosphere.