Lecture+2+outline

Lecture+2+outline - Plate Tectonics – comprehensive...

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Lecture 2: Origins of the Earth, Geology, Plate Tectonics Review of Lecture 1: Early Atmosphere & Life
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Where did life originate? The Structure of the Earth Earth’s interior is stratified by density. These layers are defined by composition : We can also divide the earth into layers by physical properties :
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Lithosphere “floats” on asthenosphere Isostacy: the buoyancy of a lighter material (crust) in a heavier material (asthenosphere) Continental Drift
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Additional evidence
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Unformatted text preview: Plate Tectonics – comprehensive theory Plate boundaries Transform plate boundaries : Convergent plate boundaries : Divergent plate boundaries: Development of modern Pacific/N. American plate tectonics Hot Spots Hot spots form where a plume of magma rises from through the mantle - usually in a fixed location There are two general ideas on what “drives” plate tectonics. They are referred to as: The convection model: The push-pull model:...
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This note was uploaded on 11/08/2010 for the course GEL 16 taught by Professor Hill,t during the Fall '08 term at UC Davis.

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Lecture+2+outline - Plate Tectonics – comprehensive...

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