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The Earth’s Layers crust Moho mantle outer core inner core Composition of the Earth’s Layers Crust: A very thin, solid outer layer. The oceanic crust is about 5 km thick. The continental crust is 30–40 km thick. Moho: The boundary between the crust and the mantle (named for the Mohorovic discontinuity). Mantle: The layer beneath the crust. The mantle is about 2885 km thick, and consists of two layers. Crust Upper mantle Lower mantle Outer core Inner core Upper mantle: Includes a solid layer fused to the crust, it is about 70 km thick. This layer combined with the crust is called the lithosphere. Beneath this is the asthenosphere, which is a flowing (plastic-like) partly molten layer. The asthenosphere is thought to be the layer upon which tectonic plates ride. The asthenosphere exists between about 100 and 250 km deep. Lower mantle: Is composed of solid rock under conditions of extremely high temperature and pressure. This layer is about 2,185 km thick. Crust Upper mantle Lower mantle Outer Core Inner Core Outer Core: A layer about 2,270 km (1,400 miles) thick, having the properties of a metallic liquid. Inner Core: A solid, metallic, spherical layer about 1,216 km (755 miles) thick. http://www.cnn.com/interactive/nature/99 03/earth.layers/frameset.exclude.html (animation of the layers)