Earth Science: Earth Materials and Processes, Book F

Chapter 6: Volcanoes

Standardized Test Practice

1
What type of volcanoes are the Hawaiian islands?
A)cinder cone volcanoes
B)composite volcanoes
C)shield volcanoes
D)explosive volcanoes
2
Magma that is forced into a crack that cuts across rock layers and hardens into igneous rock is called a(n)
A)sill.
B)volcanic neck.
C)dike.
D)batholith.
3
Which of the following is a steep-sided mountain of loosely packed tephra?
A)cinder cone volcano
B)shield volcano
C)composite volcano
D)plateau basalt
4
What is the percentage of silica in a Basaltic magma?

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A)less than 45%
B)45-52%
C)53-65%
D)greater than 65%
5
According to the graph, what is the relationship between viscosity and silica content?

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A)Magmas always have low viscosity.
B)Magmas with less silica are more viscous.
C)Magmas with little silica have medium viscosity.
D)Magmas with more silica are more viscous.
6
Why does Iceland have volcanic activity?
A)Plates are moving apart.
B)A hot spot exists.
C)Plates are moving together.
D)A convergent boundary exists.
7
Which of the following forms when magma bodies forced upward from inside Earth solidify before reaching the surface?
A)sill
B)batholith
C)volcanic neck
D)dike
8
Which of the following is the coarsest type of tephra?
A)volcanic blocks
B)volcanic ash
C)volcanic gravel
D)volcanic cinders
9
Where do volcanoes occur in the United States?

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A)the east coast
B)southern states
C)the west coast
D)the mid-west
10
Which type of magma often forms at a convergent plate boundary?
A)granitic
B)basaltic
C)tephritic
D)andesitic
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