- The intermediate layer of the Earth beneath the crust that is about 2900 km thick [1820 miles] and overlies the core of the Earth. The mantle consists of dense igneous rocks like pyroxenite and dunite, composed of the minerals pyroxene and olivine. The crust, mantle and core of the Earth are distinguished from the lithosphere and asthenosphere on the basis of their composition and not their mechanical behavior. The Mohorovicic discontinuity abruptly separates the crust from the mantle, where the velocity of compressional waves is significantly higher.
- Wadati-Benioff zone