Earth Science Geology, the Environment, and the Universe

Chapter 18: Volcanism

Chapter Tests Practice-English

1
A __________ is a large intrusive igneous rock body that covers at least 100 square km.
A)laccolith
B)batholith
C)dike
D)sill
2
Rhyolitic magma has the __________ viscosity, the __________ gas content and the __________ silica content of any type of magma.
A)highest, lowest, lowest
B)lowest, lowest, lowest
C)highest, highest, highest
D)lowest, highest, highest
3
Rock fragments thrown into the air during a volcanic eruption are called __________.
A)tephra
B)extrusive
C)granite
D)lava
4
The table shows how many eruptions were experienced by volcanoes in the past 100,000 years. Which volcano is the least likely to experience a huge eruption in present day?
<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0078746361/561661/ap.GIF','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (13.0K)</a>
A)Lassen Peak
B)Mount Hood
C)Mount Rainier
D)Mount Shasta
5
Volcanoes that form far from plate boundaries form as the result of __________.
A)volcanic bombs
B)hot spots
C)divergent plate boundaries
D)cinder cones
6
What is the name of a large volcanic crater over 1 km in diameter?
A)a vent
B)a batholith
C)a stock
D)a caldera
7
What is the water content in the magma that fuels the volcano shown in the figure?
<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078746361/561689/115_arrows1_ss_182c.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (4.0K)</a>
A)average water
B)less water
C)more water
D)water completely absent
8
What letter in the figure depicts the possible beginning of a pluton like a stock?
<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078746361/561689/113_magma_ss_180c.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (43.0K)</a>
A)A
B)B
C)C
D)None of the above
9
What letter in the figure depicts the possible beginning of plutons like dikes and sills?
<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078746361/561689/113_magma_ss_180d.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (43.0K)</a>
A)A
B)B
C)C
D)None of the above
10
What type of texture do most plutons have?
A)intermediate grained
B)coarse grained
C)fine grained
D)pegmatitic
11
When does magma form?
A)when volcanoes erupt
B)when temperatures are hot enough to melt rock
C)when grains have been compacted together
D)when new minerals form due to chemical changes in the rock
12
When magma reaches Earth's surface it is called __________.
A)intrusive
B)a batholith
C)rock
D)lava
13
Where is andesitic magma found?
A)on islands in the Pacific, such as Hawaii
B)at the margins of continents
C)in the middle of oceanic crust
D)inside of continental crust
14
Which letter in the figure demonstrates magma melting rocks after they are broken off and sink?
<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078746361/561689/113_magma_ss_180e.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (43.0K)</a>
A)A
B)B
C)C
D)None of the above
15
Why does magma move up to and through Earth's crust?
A)It is less dense than surrounding rock.
B)It is cooler than the crust.
C)It is more dense than surrounding rock.
D)It is more viscous than ocean water.
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