What are the sublayers of the earth's mantle?

The mantel is divided into two regions, the upper and lower sections. Above the upper mantle is the lithoshpere which is a rigid, rocky outer layer of the Earth, consisting of the crust. It extends to a depth of about 60 mi (100 km). read more

Earth has 4 layers. First, the crust, then the mantle comes after. Finally the inner and outer core. The crust's sub-layers are the oceanic and continental sub-layers. In the continental layer it is mostly made of granite. In the oceanic layer it is mostly made up of basalt. read more

Lithosphere consists of all the crust and the topmost part of the mantle. So the topmost part of the upper mantle is actually a part of lithosphere. Lithosphere is therefore a very hard, rocky covering and it is not very hot as compare to other layers. The average thickness of lithosphere is about 100 kilometers. read more