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Geology Chapter 4 Final Exam Study Guide Test.
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Geology Chapter 4 Final Exam Study Guide Test. "Wet" igneous rock melts at a lower temperature than the "dry" version of that same rock because A. the addition of volatiles in "wet" rocks lowers their melting temperature. B. they occur on the seafloor, where temperatures are already cold...

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  • July 26, 2024
  • 14
  • 2023/2024
  • Exam (elaborations)
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  • geology chapter 4 final exam study guide test

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Geology Chapter 4 Final Exam Study Guide Test.
"Wet" igneous rock melts at a lower temperature than the "dry" version of that same rock because
A. the addition of volatiles in "wet" rocks lowers their melting temperature.
B. they occur on the seafloor, where temperatures are already cold.
C. "dry" igneous rocks are made of more felsic minerals.
D. "wet" igneous rocks form at shallower depth in the Earth. - CORRECT ANSWER A. the addition of volatiles in "wet" rocks lowers their melting temperature.
After an explosive volcanic eruption on an island, the surrounding sea is full of light-gray floating rock. What must it be?
A. rhyolite
B. pumice
C. obsidian
D. basalt - CORRECT ANSWER B. pumice
A black, fine-grained tabular intrusion between two layers of horizontal sedimentary rock must logically be a
A. basaltic sill.
B. granitic sill. C. basaltic dike. D. granitic dike. - CORRECT ANSWER A. basaltic sill.
An igneous rock has a medium-gray, fine-grained groundmass with large crystals of plagioclase. Which of
the following statements about it is FALSE?
A. It could logically be porphyritic andesite.
B. The lava flow that produced it got quenched in ocean water.
C. The plagioclase crystals are called phenocrysts.
D. It began to crystallize at depth from intermediate-composition magma, then rose to the surface and became a lava flow. - CORRECT ANSWER B. The lava flow that produced it got quenched in ocean water.
Bowen's reaction series A. shows that minerals crystallize in a random order, with no particular pattern involved.
B. allows a geologist to predict what minerals will be found in a given igneous rock. C. is an attempt to explain the logic of formation of sedimentary rocks. D. explains why some compounds use ionic bonds and others have covalent bonding. - CORRECT ANSWER B. allows a geologist to predict what minerals will be found in a given igneous rock.
Bowen's reaction series
A. shows the sequence in which different sulfate minerals form during the progressive cooling of a melt.
B. creates a progressively more mafic melt.

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