GSU GEOL 1122K - Chapter 4 Reading Quiz (12 pages)

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Chapter 4 Reading Quiz



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Chapter 4 Reading Quiz

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Pages:
12
School:
Georgia State University
Course:
Geol 1122k - Introductory Geosciences Ii

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Wet igneous rock melts at a lower temperature than the dry version of that same rock because the addition of volatiles in wet rocks lowers their melting temperature they occur on the seafloor where temperatures are already cold dry igneous rocks are made of more felsic minerals wet igneous rocks form at shallower depth in the Earth The presence of volatiles helps break chemical bonds resulting in a lower melting temperature for the wet rock SEC 4 2 A black fine grained tabular intrusion between two layers of horizontal sedimentary rock must logically be a basaltic sill granitic sill basaltic dike granitic dike Only basaltic sill fits the description granite would be light colored and a dike would cut across existing layers SEC 4 3 Figure 4 9 After an explosive volcanic eruption on an island the surrounding sea is full of light gray floating rock What must it be rhyolite pumice obsidian basalt Pumice is a felsic vesicular rock that contains abundant vesicles which makes it less dense than water SEC 4 4 Figure 4 16a An igneous rock has a medium gray fine grained groundmass with large crystals of plagioclase Which of the following statements about it is FALSE It could logically be porphyritic andesite The lava flow that produced it got quenched in ocean water The plagioclase crystals are called phenocrysts It began to crystallize at depth from intermediate composition magma then rose to the surface and became a lava flow Not only would water quenching create a glassy texture but this explanation also doesn t touch at all on the origin of the large crystals SEC 4 4 Bowen s reaction series shows that minerals crystallize in a random order with no particular pattern involved allows a geologist to predict what minerals will be found in a given igneous rock is an attempt to explain the logic of formation of sedimentary rocks explains why some compounds use ionic bonds and others have covalent bonding Bowen s reaction series was deduced through laboratory procedures that



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