8-26 - Density – 13 g/cm 3 Mantle Core Lithosphere The...

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The earth is not a solid, singular unit but is made up of a series of concentric shells. There is slow movement of material within the earth. Journey to the Center of the Earth Accretion and differentiation
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Geotherm Temperature increases at a rate between 70 and 150 °F per kilometer into the Earth
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Earth has layered interiors. Crust Continental Oceanic Mantle Upper Lower Core Outer – Liquid Inner – Solid Earth’s Interior Layers © W. W. Norton
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Core to Crust
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The Core An iron-rich sphere with a radius of 3,480 km. 2 components with differing seismic wave behavior. Flow in the outer core generates the magnetic field. Outer core Liquid iron-nickel-sulfur 2250 km thick Density – 10-12 g/cm 3 Inner core Solid iron-nickel alloy Radius of 1230 km.
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Unformatted text preview: Density – 13 g/cm 3 Mantle Core Lithosphere The rigid shell of rock called the lithosphere ~ 70 km (43 mi). = uppermost mantle + crust Makes up Earth’s tectonic “plates” Lithosphere @ approx. 45km divided by “Moho ” “Mohorovic discontinuity ” Lithosphere density ~ 2.7–3.0 g/cm 3 Asthenosphere density ~ 3.3 g/cm3 Crust Crust divided into two parts: Continental and Oceanic – Thickest under mountain ranges (70 km – 40 miles). – Thinnest under mid-ocean ridges (3 km – 2 miles). The Earth's outermost surface It is relatively light Two Types of Crust • Crustal density controls surface position. – Continental crust • Less dense; “floats higher.” – Oceanic crust • More dense: “floats lower.”...
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8-26 - Density – 13 g/cm 3 Mantle Core Lithosphere The...

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