The lower layer of the crust.
hypothetical layer of fluid matter below rigid surface of earth's crust.
Division of the Earth's structure lying beneath the lithosphere, at a depth of approximately 70 km/45 mi to 260 km/160 mi. It is thought to be the soft, partially molten layer of the mantle on which the rigid plates of the Earth's surface move to produce the motions of plate tectonics. + prikaži više