Earth Science Geology, the Environment, and the Universe

Chapter 18: Volcanism

Chapter Test 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 highest viscosity of all magma. How is this related to its silica content, compared to the other magmas?
A)It has no silica.
B)It’s the same.
C)It’s the lowest.
D)It’s the 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?
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A)Lassen Peak
B)Mount Hood
C)Mount Rainier
D)Mount Shasta
5
Volcanoes that form far from plate boundaries form over ____ in the mantle.
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
Why are there so many volcanoes around the Pacific Ocean?
A)The magma is hottest here.
B)Convergent plate boundaries surround the Pacific Ocean.
C)Divergent plate boundaries are abundant here.
D)They form where earthquakes are common.
8
What letter in the figure depicts the possible beginning of a pluton such as a stock?
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A)A
B)B
C)C
D)None of the above
9
What letter in the figure depicts the possible beginning of a pluton such as a dike or sill?
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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?
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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.
16
What is the name of a large volcanic crater that is greater than 1 km in diameter?
A)vent
B)batholith
C)stock
D)caldera
17
Locate the volcano Surtsey in the figure. What conditions explain its presence?
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A)Two continental plates are converging here.
B)There is an oceanic-continental plate boundary.
C)It sits on a divergent plate boundary.
D)It is an oceanic-oceanic convergence zone.
18
What geologic data can be used to determine the relative ages of these islands?
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A)size
B)positions
C)shapes
D)compositions
19
What effect does the amount of silica have on magma?
A)It makes it thicker.
B)It makes it thinner.
C)It makes it darker.
D)It makes it smoother.
20
What type of volcano forms as small pieces of tephra fall back toward the vent and build up around it?
A)cinder cone
B)composite
C)lava dome
D)shield
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