1) Outermost layer of the Earth is called as crust.
2) mantle is defined as one of the three main layers of
the Earth. It lies between the innermost layer, the core, and the thin
outermost layer, the crust. The mantle consists of hot, dense, semisolid rock and is about 2,900 kilometers (1,802 miles) thick.
3) The lithosphere is defined as the solid outermost shell of a rocky planet. On the Earth, the lithosphere includes the crust and the uppermost layer of the mantle (the upper mantle or lower lithosphere) which is joined to the crust. The lithosphere is broken up into different plates.
4) The asthenosphere is thought to extend from about 60 mi (100 km) to about 450 mi (700 km) below the Earth's surface.