Class Notes Exam 3 - 15:03 0degCiceturnstoliquid...

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15:03 0 deg C- ice turns to liquid 100 deg C liquid turns to steam beginning of all magnetism is partial melting of mantle when mantle is melted initial temp is fixed by mineral that is present therefore  same magma will be produced by partial melting results in basalt geotherm depressed under continental plates -> melting not occurring mid ocean ridges- passive convection, passive rising of the mantle supply new magma to where plates are spreading to thicken it  tectonics spreading plate apart trying to thin and break it apart rock density increases with depth magma wants to come to surface because it is less dense than the rocks magma pools at position of natural buoyancy mid Atlantic ridge- depression- spreading slow 2cm yr East Pacific Rise- spreading fast- 16cm yr-  fast spreading zone- deeper and hotter mantle coming to surface slow spreading zone- shallower and cooler mantle coming to surface
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This note was uploaded on 09/26/2010 for the course GEO 416k taught by Professor Staff during the Fall '08 term at University of Texas at Austin.

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Class Notes Exam 3 - 15:03 0degCiceturnstoliquid...

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