sept 8 - Sources of heat planetesimal and meteorite...

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GLG 101, September 8, 2010 Magma and Igneous Rocks: Igneous Rocks – (volcano- a vent where molten rock comes out of Earth) Hot, syrupy lava runs downhill as a lava flow, the lava flow slows, loses heat and crusts over, finally the flow stops and cools forming an igneous rock. A solidified molten rock that freezes at high temperature Earth is mostly igneous rock. Volcano erupt magma Melted rock can cool above or below ground. Intrusive igneous rock – cool slowly underground Extrusive igneous rock – cool quickly at the surface
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Unformatted text preview: Sources of heat- planetesimal and meteorite accretion, gravitational compression, differentiation, decay of radioactive minerals, tidal pull of the Sun and Moon. The crust does not float on a sea of molten rock. Magma Formation – forms in special settings that melt existing rocks. Partial melting occurs in the crust and upper mantle. Melting is caused by pressure release, volatile addition, and heat transfer What is magma made of – magmas have 3 components (solid, liquid, gas)...
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