lecture 12 - The earths interior Core spherical central...

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The earth’s interior Core: spherical central region, 2,200 mile thick, mostly iron;outer core is liquid, inner layer is solid. Mantle: rock shell that surrounds core, 1,800 mi thick Crust: outermost earth layer, 10-25 mi thick, Know layers of the earth. Diagram of earth’s interior. Inner core, liquid outer core, solid mantle (very large), crust (very small), The mantle: to drill through the mantle, you would have to drill through miles and miles of crust. The aesthenosphere is part of the mantle that is close enough to the core that is is heated up. Lithosphere and aesthenosphere Aesthenosphere: weak layer of the mantle, extends down to about 185 mi; rock temp close to melting point Lithosphere: very strong, rigid rock layer above the aesthenosphere; includes the crust and upper part of the mantle. Aesthenosphere can yield by slow flowage, allows rigid lithosphere to move over it. Lithospheric plate: the portion of the litho that is moving as a unit, contact zones between plates called plate boundaries Geologic time: Age of universe: 17 – 18 B.Y. (billion years old)
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