08 NOTES - Sam Krepps 1.22.08 NOTES I. Core A. Inner Core...

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1.22.08 NOTES I. Core A. Inner Core 1. Solid iron alloy 2. 4300 deg C (1) Solid due to high pressure 3. Density of 13 g/cm3 4. Growing as Earth cools B. Outer Core 1. Liquid iron alloy 2. Density of 11g/cm3 3. Convecting (stirring) (1) Produces the Earth’s magnetic field 4. Decreasing as Earth cools 5. Know composition from (1) Measurements of Earth’s density (a) Need a lot of mass in core (2) Meteorites (a) Many meteorites are iron alloys ad are the remnant cores of destroyed planets C. Mantle 1. Largest part of Earth 2. Composed of peridotite rock rich in: (1) Iron (Fe) (2) Magnesium (Mg) (3) Silicon (Si) 3. Density of 5.5 (base) to 3.5 g/cm3 (top) 4. Composed by three layers defined by sudden increases in density (1) Lower mantle (2) Transition zone (3) Upper mantle D. Crust 1. <1% of the Earth’s radius 2. Oceanic crust: (1) Composes sea floor (2) Thin (2-7 km thick) (3) Density 3.2 grams/cm3 (4) Rich in Fe and Mg 3. Continental crust: (1) Composes the continents (a) Thick (40-125 km thick)
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This note was uploaded on 04/17/2008 for the course ESCI 221 taught by Professor Price during the Spring '08 term at Millersville.

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08 NOTES - Sam Krepps 1.22.08 NOTES I. Core A. Inner Core...

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