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Multiple Choice Quiz
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1
Mt. St. Helens:
A)overlies a subduction zone.
B)is located in South America.
C)is an extinct volcano.
D)all of these
2
Volcanic eruptions can affect climate because:
A)they are tall mountain peaks.
B)they recycle water vapor to make clouds.
C)they heat the atmosphere.
D)none of these
3
Magma extruded at low temperatures tends to be:
A)very dry.
B)very fluid.
C)very viscous.
D)very unwelcome at a party.
4
Magma with a low silica content tends to be:
A)very smelly.
B)very viscous.
C)very fluid.
D)also very unwelcome at a party.
5
Magma with a large amount of dissolved gases tends to be:
A)very messy.
B)very viscous.
C)very explosive.
D)really truly very unwelcome at a party.
6
Magma is:
A)the reason volcanoes form.
B)the source of all igneous rocks.
C)melted rock.
D)all of these
7
Which of the following does not affect the viscosity of magma?
A)amount of gases
B)silica content
C)temperature
D)All of these affect the viscosity of a magma.
8
Which of these is not a common gas in magma?
A)methane
B)sulfur dioxide
C)carbon dioxide
D)water vapor
9
The asthenosphere is:
A)not a real place, but a hypothetical one proposed by geologists.
B)the source of most magmas.
C)completely molten.
D)completely solid.
10
Submarine eruptions of volcanoes:
A)have never been observed.
B)cannot occur because water causes magma to solidify too quickly.
C)form pillow basalts.
D)none of these
11
Which of the following eruptions was the largest?
A)Agung, Indonesia (1960).
B)Tambora, Indonesia (1815).
C)Krakatau, Indonesia (1883).
D)Yellowstone, Wyoming (640,000 years ago).
12
A typical example of a shield volcano is:
A)Mt. Pinatubo.
B)Mt. Rainier.
C)Hawaii.
D)Mt. St. Helens.
13
Which type of volcano is not commonly composed of andesite?
A)composite volcano
B)cinder cone
C)volcanic dome
D)shield volcano
14
An igneous rock made of pyroclasts has a texture called:
A)fine-grained.
B)vesicular.
C)porphyritic.
D)fragmental.
15
The largest known shield volcanoes on Earth occur in:
A)Iceland.
B)the Andes mountains.
C)Hawaii.
D)the Cascades.
16
Crater Lake in Oregon is an example of:
A)a volcanic crater.
B)a cinder cone.
C)a shield volcano.
D)a caldera.
17
Mafic igneous rocks contain:
A)about 80% silica.
B)about 70% silica.
C)about 60% silica.
D)about 50% silica.
18
Obsidian is an igneous rock that:
A)solidified in Earth's mantle.
B)solidified beneath Earth's surface.
C)solidified very slowly to form pegmatite.
D)solidified very rapidly to form glass.
19
The most common type of volcano in the "Ring of Fire" is:
A)a volcanic fissure.
B)a cinder cone.
C)a shield volcano.
D)a composite volcano
20
Which planet is not known to have volcanoes?
A)Saturn
B)Mars
C)Earth
D)Venus





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