Earth Science: Geology, the Environment, and the Universe

Section 2: Classifying Igneous Rocks

Classifying Igneous Rock

1
Which rock shown in the figure cooled the fastest?
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A)fine-grained
B)porphorytic
C)glassy
D)coarse-grained
2
What is an example of an igneous ore deposit?
A)metal-rich quartz veins
B)placer deposits
C)hydrothermal deposits
D)porphyritic deposits
3
According to the map shown in the figure, which area of Earth contains the highest concentrations of quartz and feldspars?
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A)North America
B)the west coast of the U.S.
C)the Pacific Ocean
D)Hawaii
4
According to the figure, what type of rocks can include quartz?
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A)peridotite
B)granite
C)gabbro
D)basalt
5
According to the figure, what types of minerals are ultramafic?
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A)feldspar and biotite
B)pyroxine and olivine
C)amphibole and pyronene
D)feldspar and quartz
6
An igneous rock with two distinct grain sizes has a __________ texture.
A)felsic
B)fine-grained
C)porphyritic
D)coarse-grained
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