Its upper regions is dominated by peridotite and olivine, but the lower part of this layer is dominated by magnesium silicate perovskite.
Komatiites are rocks derived from this layer during the early part of the Earth's history. The bottom of an ophiolite is made of material from this layer. Its upper regions is dominated by peridotite and olivine, but the lower part of this layer is dominated by magnesium silicate perovskite. Upwellings of high temperature rock from this region are called its namesake (*) plumes. The asthenosphere is located withing this layer and its upper boundary is the Moho. For 10 points, name this layer of the Earth between the crust and upper core.
Komatiites are rocks derived from this layer during the early part of the Earth's history.
{mantle}