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The Earth’s Layers

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.

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The Earth’s Layers

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  1. The Earth’s Layers

  2. crust Moho mantle outer core inner core Composition of the Earth’s Layers

  3. 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.

  4. Crust Upper mantle Lower mantle Outer core Inner core

  5. 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.

  6. Lower mantle: Is composed of solid rock under conditions of extremely high temperature and pressure. This layer is about 2,185 km thick.

  7. Crust Upper mantle Lower mantle Outer Core Inner Core

  8. 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.

  9. http://www.cnn.com/interactive/nature/9903/earth.layers/frameset.exclude.htmlhttp://www.cnn.com/interactive/nature/9903/earth.layers/frameset.exclude.html (animation of the layers)

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