Georgia Science Grade 6

Chapter 12: Volcanoes

CRCT Practice

1
Which of the following terms best describes the rock in the photo?
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A)aa
B)pahoehoe
C)pillow lava
D)ash
2
Which of the following is made of layers of ash and cooled lava flows?
A)shield volcano
B)plateau basalts
C)composite volcano
D)cinder cone volcano
3
Which of the following volcanoes is located in the United States?
A)Hekla
B)Paricutin
C)Mount Vesuvius
D)Mount St. Helens
4
What relationship can be inferred from the graph?
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A)Magmas that have more silica are more viscous.
B)Magmas that have less silica are more viscous.
C)Magmas always have low viscosity.
D)There is no relationship between silica content and viscosity.
5
What is the percentage of silica in granitic magma?
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A)less than 45%
B)45–52%
C)53–65%
D)greater than 65%
6
Which of the following igneous features is parallel to the rock layers that it intrudes?
A)batholith
B)volcanic neck
C)sill
D)dike
7
Which of the following forms when the top of a volcano collapses into a partially emptied magma chamber?
A)fissure
B)crater
C)caldera
D)volcanic neck
8
Which of the following is the finest type of tephra?
A)volcanic ash
B)volcanic bombs
C)volcanic cinders
D)volcanic blocks
9
Which of the following is the mean of the water vapor data in the table?
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A)59.6
B)60.1
C)59.8
D)61.4
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