Multiple Choice Questions

What do pumice and scoria have in common?
  • Decompression melting of the mantle
  • It is less dense than the surrounding rock.
  • Felsic magma and mafic residue
  • They both exhibit a vesicular texture.
How is basaltic magma transformed into felsic magma?
  • A mineral that makes up a relatively small portion of the total rock composition
  • Basaltic magma partially melts the continental crust, which is more felsic in composition.
  • Felsic magma and mafic residue
  • Quartz, K-feldspar, and plagioclase feldspars, with relatively fewer biotite and amphiboles
You have found a mafic rock with a phaneritic texture. What is a potential rock name?
  • batholith
  • Gabbro
  • False
  • quartz
When lava erupts at Earth's surface, what type of rock is produced?
  • extrusive
  • ash and cinders
  • Andesite porphyry
  • batholith
Based on the diagram shown in the video, name two minerals that are unlikely to coexist in the same igneous rock.
  • Granite is phaneritic and rhyolite is aphanitic.
  • Quartz, K-feldspar, and plagioclase feldspars, with relatively fewer biotite and amphiboles
  • Quartz and muscovite Muscovite and pyroxene**** Na-plagioclase and amphiboles Quartz and feldspar Pyroxene and olivine
  • Because batholiths form deep within Earth, the occurrence of one at the surface implies that it has since been uplifted and/or the rocks above have been removed.
Which of the following best describes the difference between granite and rhyolite?
  • Andesite porphyry
  • batholith
  • Mafic igneous rocks are rich in Fe, Mg, and Ca.
  • Granite is phaneritic and rhyolite is aphanitic.
What is the rock name of an intermediate rock with two distinct grain sizes?
  • batholith
  • Granite is phaneritic and rhyolite is aphanitic.
  • Andesite porphyry
  • olivine; mantle
Igneous rocks of felsic composition have __________ and __________ relative to mafic igneous rocks.
  • the melting temperature of mantle rocks to decrease
  • It is less dense than the surrounding rock.
  • Granite is phaneritic and rhyolite is aphanitic.
  • greater silica; lower melting temperature
Pyroclastic debris from a volcanic eruption can include _____.
  • Andesite porphyry
  • olivine; mantle
  • ash and cinders
  • the mantle and crust
In a subduction zone, water driven from subducted oceanic crust causes __________.
  • the melting temperature of mantle rocks to decrease
  • the mantle and crust
  • greater silica; lower melting temperature
  • Granite is phaneritic and rhyolite is aphanitic.
Ultramafic rocks contain __________ and are commonly found in __________.
  • Andesite porphyry
  • ash and cinders
  • olivine; mantle
  • the mantle and crust
Batholiths are known to form the cores of mountain ranges such as the Sierra Nevada. What is the implication of this observation?
  • Because batholiths form deep within Earth, the occurrence of one at the surface implies that it has since been uplifted and/or the rocks above have been removed.
  • Quartz, K-feldspar, and plagioclase feldspars, with relatively fewer biotite and amphiboles
  • sill
  • Quartz and muscovite Muscovite and pyroxene**** Na-plagioclase and amphiboles Quartz and feldspar Pyroxene and olivine
Which of the following terms is best described as a massive pluton?
  • extrusive
  • batholith
  • Mafic igneous rocks are rich in Fe, Mg, and Ca.
  • Granite is phaneritic and rhyolite is aphanitic.
Why does magma have a tendency to rise after its formation?
  • Mafic igneous rocks are rich in Fe, Mg, and Ca.
  • Decompression melting of the mantle
  • They both exhibit a vesicular texture.
  • It is less dense than the surrounding rock.
While working in the field, you find a dike cutting across some sedimentary rocks. What grain size would you expect to find in this pluton?
  • batholith
  • fine-grained
  • olivine; mantle
  • extrusive
What causes an elevated geothermal gradient in a divergent plate setting?
  • They both exhibit a vesicular texture.
  • Andesite porphyry
  • Decompression melting of the mantle
  • It is less dense than the surrounding rock.
Most igneous rocks never reach the surface. However, igneous rocks other than those formed in volcanoes are found exposed on many parts of Earth. How do you account for this phenomenon?
  • greater silica; lower melting temperature
  • the melting temperature of mantle rocks to decrease
  • They both exhibit a vesicular texture.
  • They formed at depth and have been exposed by uplift and erosion.
As a result of partial melting, magma originates in __________.
  • ash and cinders
  • the mantle and crust
  • Felsic magma and mafic residue
  • the melting temperature of mantle rocks to decrease
According to Bowen's Reaction Series, __________ is one of the first minerals to melt, but last to crystallize.
  • batholith
  • Gabbro
  • Quartz and muscovite Muscovite and pyroxene**** Na-plagioclase and amphiboles Quartz and feldspar Pyroxene and olivine
  • quartz
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Multiple Choice Questions
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