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Aim: How is Earth’s interior Structured? Do Now: Why do you think Earth has layers? What material do you think make up those layers? I. Layers of the Earth Earth’s interior consists of layers each defined by specific composition and density. A) Crust - thin outer rocky layer - Oceanic Crust – made of basalt bedrock (more dense) - Continental Crust – Granite Bedrock (less dense) B) Mantle - thickest layer consisting plastic fluid-like material **Mantle composition determined from meteorites. C) Core - deepest layers of the Earth. - composed of iron and nickel. - Outer Core – liquid iron and nickel - Inner Core – solid iron and nickel II. Physical Properties A) Lithosphere – consists of the crust and uppermost mantle. - Forms a cool, rigid shell made of rock. B) Asthenosphere – - a soft, weak layer beneath the lithosphere. - rocks are close to their melting points in this layer. (plastic-fluid like material) III. Discovering New Layers Moho - (Mohorovicic Discontinuity) - separates the crust from the underlying mantle within the lithosphere. Page 10 - ESRT Closure: • Please complete the worksheet on Layers of the Earth.