L05_11-13_Sept_Earth_Interior(1)

The crystallizaon releases heat that along with

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Unformatted text preview: more duc>le, less dense layer below the lithosphere. This is the layer upon which tectonic plates ‘slide’. Extends from 100- 200 km to about 660 km depth. Rela>vely low seismic velocity. Mg, Fe Silicates Primarily Fe, minor Ni 32 Isosta>c Depression / Rebound Lithosphere: Rigid, briple surface layer, ~100 km thick. The lithosphere is made up of the ~8 major plates and ~7 minor plates Asthenosphere: Weaker, more duc>le, less dense layer below the lithosphere. This is the layer upon which tectonic plates ‘slide’. Extends from 100- 200 km to about 660 km depth. Rela>vely low seismic velocity. Mg, Fe Silicates Primarily Fe, minor Ni 33 dynamical structure of Earth (a view of Earth based on how resistant materials are to flowing or shearing) Lithosphere: Rigid, briple surface layer, ~100 km thick. The lithosphere is made up of the ~8 major plates and ~7 minor plates Asthenosphere: Weaker, more duc>le, layer below the lithosphere. This is the layer upon which tectonic plates ‘slide’. Extends from 100- 200 km to about 660 km depth. Rela>vely low seismic velocity. Mg, Fe Silicates Mesosphere: Stronger, denser, more Primarily Fe, rigid por>on of the mantle extending minor Ni from ~660 km depth to the core (~2700 km). Upper boundary is defined by a sharp increase in seismic wave veloci>es. 34 dynamical structure of Earth Liquid outer core Liquid layer extending from ~2700 km deep to ~5200 km deep. Viscosity is possibly quite low, similar to that of motor oil (~0.07 Pa*s). Composi>on is molten Fe (iron). Convec>on of the outer core is thought to be the source of Earth’s magne>c field. Temperatures range between 4400 – 6100°...
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