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08 NOTES - Sam Krepps 1.29.08 NOTES I Plate Tectonics A...

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Sam Krepps 1.29.08 NOTES I. Plate Tectonics A. Processes associated with the creation, movement, and destruction of the Earth’s lithospheric plates B. The unifying concept of how the outer part of the Earth evolves C. Believes that the Earth’s crust is divided into a number (~20) of horizontal plates which move D. Plate boundaries are characterized by earthquakes and sometimes volcanism II. Internal Structure of the Earth A. Mantle 1. Mostly solid, but small amounts of liquid present 2. Composed of iron and magnesium rich silicates termed peridotite 3. Middle is termed the asthenosphere (asthenos = weak) (1) Hot and slowly flowing due to small amount of liquid (2) Permits lithospheric plates to move 4. Upper portion is rigid and is part of lithosphere B. Mohorovicic Discontinuity (Moho) 1. Separates the crust from the mantle 2. Crust density 2.8 grams/cm3, mantle density of 4.5 grams/cm3 (1) Therefore, crust floats on mantle C. Crust 1. Top of lithosphere 2. Less than 1% of the radius of the Earth 3.
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