One portion of this region is dominated by a mixture containing significant portions of clinopyroxene and orthopyroxene called lherzolite, and this region's lowest portion is called the D double-prime layer. This region rich in olivine exhibits an increase in S-wave and P-wave velocities at the Hales discontinuity and has a lower boundary defined by the Gutenberg discontinuity. This region's upper boundary is the Moho discontinuity, and it contains the asthenosphere and the lower portion of the 
One portion of this region is dominated by a mixture containing significant portions of clinopyroxene and orthopyroxene called lherzolite, and this region's lowest portion is called the D double-prime layer. This region rich in olivine exhibits an increase in S-wave and P-wave velocities at the Hales discontinuity and has a lower boundary defined by the Gutenberg discontinuity. This region's upper boundary is the Moho discontinuity, and it contains the asthenosphere and the lower portion of the lithosphere. Located between the outer core and the crust, For 10 points, name this layer of the Earth.
One portion of this region is dominated by a mixture containing significant portions of clinopyroxene and orthopyroxene called lherzolite, and this region's lowest portion is called the D double-prime layer.
The {Mantle}