Geology 101 Igneous RocksI_2007

Geology 101 Igneous RocksI_2007 - Igneous Rocks I What is a...

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Igneous Rocks I
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What is a rock ? [Yes, you really do care.]
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The Nature of Igneous Rocks Form from Magma [Greek=“paste”] Hot, partially molten mixture of solid liquid and gas – Gases: H 2 O, CO 2 , etc. less dense than solid rock solidify upon cooling
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Magma vs. Lava Magma : molten rock beneath the surface Lava : molten rock that has reached the surface Magma: form intrusive igneous rocks Lava: form extrusive igneous rocks
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Sawtooth Mtns. near Stanley, ID -example of a intrusive igneous rocks ….not to mention a very cool place to do fieldwork……
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“The beer I had for breakfast wasn’t bad so I had one more for desert.” - Sunday Morning Coming Down by Kris Kristofferson
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Lava flow in Hawaii [magma @ the Earth’s surface] Pyroclastic Flow Montserrat Volcano
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Composition varies widely Oxygen plus major elements – Generally a silica (SiO 2 ) melt Silica and water content control viscosity Silica content used in classification
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This note was uploaded on 10/26/2009 for the course GLY 123 taught by Professor Vogl during the Spring '09 term at University of Florida.

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Geology 101 Igneous RocksI_2007 - Igneous Rocks I What is a...

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