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HW 2 - NAME GEOLOGY 100 HOMEWORK#2 25 Points DUE Friday 1...

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NAME:_________________________ GEOLOGY 100 HOMEWORK #2 25 Points DUE Friday, February 22, 2008 1. Why do intrusive igneous rocks have phaneritic textures and extrusive igneous rocks have aphanitic textures? (2 pts) 2. The four main magma types are listed across the top of the chart below in order of increasing silica content. Other magma characteristics are listed along the left side. For each magma characteristic, indicate if the ultramafic or the silicic end is the “high” or “low” or “dark” or “light” end in the magma sequence. The magma characteristic “silica content” has already been done for you as an example.(2 1/2 pts) Ultramafic Mafic Intermediate Silicic Silica content LOW HIGH Iron & magnesium content _______ _______ Magma temperature _______ _______ Viscosity _______ _______ Density _______ _______ Darkness/Lightness of Color _______ _______ 3. For each intrusive igneous rock listed below, give the name of the chemically equivalent extrusive igneous rock. (2 pts) Peridotite ______________ Gabbro ______________ Diorite ______________ Granite ______________ 4.
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