Earth Science Geology, the Environment, and the Universe

Section 2: Classification of Igneous Rocks

Self-Check Quizzes-English

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
Igneous rocks are identified by their composition and texture characteristics. What does texture refer to?
A)overall color
B)crystal size
C)rough or smooth feel
D)presence of vesicles
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
The history of cooling is preserved in the rock. What does a porphyritic texture mean in terms of cooling history?
A)The magma cooled quickly all at once.
B)The magma cooled quickly, and then the cooling slowed down.
C)The magma cooled slowly at first, and then the cooling sped up.
D)The magma stayed molten at first, and then the cooling cooled slowly.
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