Table 3 roc
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Louisiana Technical College *
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Subject
Geology
Date
Feb 20, 2024
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docx
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Table 3.1 in your Physical Geology text lists the estimated proportions of several oxides in felsic, intermediate, and mafic magma. Review the table above. Given the oxide percentages provided for Rock
1, what is its classification?
Question options:
Felsic -not
Intermediate
Mafic
Question 2
0 / 2 points
Table 3.1 in your Physical Geology text lists the estimated proportions of several oxides in felsic, intermediate, and mafic magma. Review the table above. Given the oxide percentages provided for Rock
2, what is its classification?
Question options:
Felsic
Intermediate-not
Mafic
Question 3
0 / 2 points
Table 3.1 in your Physical Geology text lists the estimated proportions of several oxides in felsic, intermediate, and mafic magma. Review the table above. Given the oxide percentages provided for Rock
3, what is its classification?
Question options:
Felsic
Intermediate
Mafic
Question 4
0 / 2 points
SiO2
Al2O3
FeO
CaO
MgO
Na2O
K2O
Rock 1
52%
17%
10%
10%
6%
3%
2%
Rock 2
70%
13%
3%
4%
3%
4%
3%
Rock 3
65%
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16%
4%
4%
3%
6%
2%
Rock 4
55%
18%
10%
7%
6%
3%
1%
Table 3.1 in your Physical Geology text lists the estimated proportions of several oxides in felsic, intermediate, and mafic magma. Review the table above. Given the oxide percentages provided for Rock
4, what is its classification?
Question options:
Felsic
Intermediate
Mafic
Question 5
0 / 2 points
In most cases, the size of a crystal can provide information about the rate at which the crystal cooled. If a crystal is very large, what does that tell you about how long it took the magma to cool? Question options:
It took the magma a long time to cool
The magma cooled very quickly
Question 6
2 / 2 points
Which type of igneous rock would you expect to contain 70% plagioclase feldspar?
Question options:
felsic intermediate
mafic
ultramafic
Question 7
0 / 2 points
Which type of igneous rock would you expect to contain 75% pyroxene, but only 10% olivene? Question options:
Felsic
intermediate
mafic
ultramafic
Question 8
2 / 2 points
Which type of igneous rock would you expect to contain 30% quartz?
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Question options:
felsic
intermediate
mafic
ultramafic
Question 9
2 / 2 points
Which type of igneous rock would you expect to contain 60% pyroxene and 40% olivene?
Question options:
Felsic
Intermediate
Mafic
Ultramafic
Question 10
2 / 2 points
Granite would be classified as which type of igneous rock?
Question options:
Felsic
Intermediate
Mafic
Ultramafic
Question 11
2 / 2 points
Basalt is
Question options:
an intrusive igneous rock
an extrusive igneous rock
Question 12
2 / 2 points
Diorite contains what percent of pyroxene?
Question options:
0%
50-70%
0-20%
0-25%
Question 13
2 / 2 points
Which term would you use to describe an intrusive igneous rock that has crystals that are large enough to see with the naked eye? Answer:
Phaneritic
Question 14
0 / 2 points
Which term would you use to describe an igneous rock that has large crystals embedded in a matrix of much smaller crystals?
Answer:
the groundmass
Question 15
0 / 2 points
Which term would you use to describe an intrusive igneous rock that has crystals that are too small to see with the naked eye?
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