Paper 2 - Tyler VanGilder 2/28/08 Plate Tectonics ID #:...

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Tyler VanGilder 2/28/08 Plate Tectonics ID #: 825-469-751 Plate Tectonics
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Plate tectonics shift the very world we live in over-time and are continuously shifting and changing the layout of the world. The basic theory of plate tectonics states that the lithosphere is a shell of hard, strong rock about 100 kilometers thick that floats on the hot, plastic asthenosphere. The lithosphere is also broken into seven segments called tectonic plates. The tectonic plates glide over the asthenosphere and the continents and oceans move with it (Thompson, 137). These large plates shifting over the asthenosphere drastically affect the shape of the world over time. A basic plate boundary is a fracture that separates one plate from another (Thompson, 137). Plates can move in three different ways; divergent, convergent, and transform boundaries. At these boundaries the plate movement is noticed and the larger the forces at the boundaries, mountain ranges emerge and cause volcanic eruptions along with earthquakes. Divergent plate boundaries, or spreading center/rift zone, are where two plates move away from one another (Thompson, 137). The spreading of the plates causes the asthenosphere to seep up and some melts to become magma. Most of this action occurs underneath sea level but this cooling of magma creates new crust.
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Paper 2 - Tyler VanGilder 2/28/08 Plate Tectonics ID #:...

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