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Anatomy of the interior of Earth – Making a pie slice of the Earth. Anatomy of the earth – Pie Slice Inner core: first 1220 km layer of interior of the earth. Iron-Nickel and solid Solid because of the pressure Outer core: next 2260 km layer Iron – Nickel and liquid the flow and movement of Iron causes earth’s magnetic field Lower mantle: next 2230 km layer rigid layer, but still capable of movement (especially next to the liquid outer core. Upper mantle: next 660 km layer solid and rocky layer Crust: 5-70 km thin outer layer Average thickness – 35 km Oceanic – denser than continental crust; about 5 km thick Continental – less dense than oceanic crust; about 70 km thick Lithosphere – Crust and part of upper mantle extends about 100 km into the interior of Earth. Cool rigid shell Asthenosphere – Part of the upper mantle extends about 200 km into the interior of Earth. soft weak layer that lies under the lithosphere Moho – Morohorovic discontinuity, The boundary that separates the crust from the mantle. Tectonic plates – The lithosphere is divided into sections called plates that move over the softer asthenosphere.