Question 1

Pillow lavas are_______ .

Accepted Answer

A)   andesitic bombs erupted from a cinder cone that accumulate as pillow- like masses around the cone
B)   basaltic lava tubes erupted on the seafloor in volcanic piles analogous to toothpaste extruded from a tube
C)   rhyolite glasses that develop a banding that resembles a pillow case with internal snowflake obsidian that looks like feathers
D)   basaltic magmas erupted on the seafloor as magma blobs from an explosive, submarine eruptionE) B) and C)
F) A) and D) B

Question 2

Examine the words and/or phrases below and determine the relationship among the majority of words/phrases. Choose the option which does not fit the pattern.

Accepted Answer

A)   volcanic bomb
B)   pillow lava
C)   pahoehoe
D)   aaE) A) and B)
F) A) and C)

Question 3

A _______ is a near surface, intrusive igneous rock body that results from local inflation of a horizontal sill.

Accepted Answer

A)   batholith
B)   laccolith
C)   dike
D)   volcanic neckE) A) and B)
F) A) and C)

Question 4

In the movie "Volcano" basaltic lava flows are shown running down flat streets at speeds faster than humans could run. From your knowledge of magma viscosity, is this realistic?

Accepted Answer

A)   Yes, the viscosity of basalt magma is similar to water so it would flow at comparable rates.
B)   No, the viscosity of basaltic magma is much higher than water, and thus, would flow much faster than water.
C)   No, the viscosity of basaltic magma is much higher than water, and thus would flow much slower than water.
D)   There is no way of knowing because basaltic magmas can have viscosities similar to water or higher depending on temperature and fluids, and thus there isn't enough information.E) B) and C)
F) All of the above

Question 5

Pillow lavas are _______.

Accepted Answer

A)   ryholitic magmas that form at pyroclastic flows
B)   rhyolitic magmas extruded as piles of bombs that accumulate in piles of rocks that look like a pile of pillows
C)   basaltic magmas extruded as piles of bombs that accumulate in piles of rocks that look like a pile of pillows
D)   basaltic magmas that form at pyroclastic flowsE) A) and B)
F) A) and C) C

Question 6

Compare and contrast the following: shield volcanoes, composite cones/stratovolcanoes, and cinder cones.

Accepted Answer

Students should note that while all of t...

Question 7

A volcanic deposit comprised of red to black lapilli- sized pyroclastic material associated with pahoehoe lava flows was probably deposited on_______ .

Accepted Answer

A)   a large composite volcano
B)   a satellite shield volcano on a rhyolitic caldera
C)   a cinder cone
D)   a shield volcanoE) B) and C)
F) A) and D) C

Question 8

The Columbia Plateau in the northwestern United States is an excellent example of_______ .

Accepted Answer

A)   flood basalts
B)   pyroclastic flow deposits
C)   an eroded shield volcano
D)   silica- rich lava flowsE) B) and C)
F) None of the above

Question 9

Section 6.5 of the chapter notes that most shield volcanoes begin as seamounts and grow from there. What is the driving force behind this action?

Accepted Answer

A)   fracture zones
B)   convergent boundaries
C)   divergent boundaries
D)   hot spot tectonicsE) A) and C)
F) B) and C)

Question 10

Volcano A erupts rocks with SiO2 content ranging from 49% to 52% whereas volcano B, 100km away, erupts materials with SiO2 content of 62- 68%. Which statement best characterizes these two volcanoes?

Accepted Answer

A)   Volcano A is likely to be a supervolcanoes with violent eruptions, whereas volcano B is probably a shield volcano with quiescent eruptions.
B)   Both volcanoes are shield type volcanoes that are characterized by quiescent eruptions.
C)   Both volcanoes are violent, explosive volcanoes that spread ash continent wide.
D)   Volcano A is probably a shield volcano with typically quiescent eruptions, whereas Volcano B is likely a stratovolcano characterized by violent, explosive eruptions.E) All of the above
F) A) and B)

Question 11

Examine the words and/or phrases below and determine the relationship among the majority of words/phrases. Choose the option which does not fit the pattern.

Accepted Answer

A)   Mount Pelée
B)   Mt. Vesuvius
C)   Mt. Mazama
D)   KilaueaE) A) and B)
F) A) and C)

Question 12

Kilauea is an example of a _______.

Accepted Answer

A)   volcanic neck
B)   shield volcano
C)   lava dome
D)   cinder coneE) None of the above
F) C) and D)

Question 13

Which of the following volcano types are short lived volcanoes that last a few days to months and then shut down?

Accepted Answer

A)   cinder cone
B)   lava dome
C)   shield volcano
D)   composite volcanoE) A) and C)
F) B) and D)

Question 14

When Mt. St. Helens erupted in May of 1980, ash blew as far away as _______.

Accepted Answer

A)   Idaho
B)   New Jersey
C)   Italy
D)   OklahomaE) None of the above
F) All of the above

Question 15

Volcanic bombs originate_______ .

Accepted Answer

A)   as ash particles that join together in the eruptive plume and fall as cobble- sized objects
B)   as blocks of volcanic rock ejected from an erupting volcanic crater
C)   as enormous blocks launched in a solid form from a volcanic plug
D)   as erupted magma blobs that partly congeal before falling to the groundE) A) and B)
F) A) and C)

Question 16

Which type of basaltic lava flow has its surface covered with sharp- edged, angular blocks and rubble?

Accepted Answer

A)   scoria
B)   pillow lava
C)   pahoehoe
D)   aaE) A) and B)
F) A) and C)

Question 17

Which one of the following statements concerning cinder cones is false?

Accepted Answer

A)   They are built mostly or entirely during one eruptive cycle.
B)   The cinders most commonly are basaltic.
C)   The cinders and other pyroclastic particles are normally consolidated into welded tuff.
D)   They are small volcanoes with fairly steep sides.E) A) and B)
F) A) and C)

Question 18

Match the letter on the figure with the term.
 
-Identify what letter E represents in the diagram.

Accepted Answer

A)   bomb
B)   lava flow
C)   magma chamber
D)   vent
E)   pyroclastic materialF) D) and E)
G) C) and E)

Question 19

The higher the viscosity of a magma, the _______the potential for explosive eruptions.

Accepted Answer

A)   higher
B)   lowerC) A) and B)
D) undefined

Question 20

Which type of plate margin is characterized by volcanoes that include basalt, andesite, dacite and rhyolite?

Accepted Answer

A)   transform faults
B)   convergent plate margins
C)   hot spots
D)   spreading ridgesE) B) and D)
F) A) and D)

Exam 6: Volcanoes and Other Igneous Activity

Pillow lavas are_______ .

Correct AnswerverifiedB

Examine the words and/or phrases below and determine the relationship among the majority of words/phrases. Choose the option which does not fit the pattern.

Correct AnswerverifiedShow Answer

A _______ is a near surface, intrusive igneous rock body that results from local inflation of a horizontal sill.

Correct AnswerverifiedShow Answer

In the movie "Volcano" basaltic lava flows are shown running down flat streets at speeds faster than humans could run. From your knowledge of magma viscosity, is this realistic?

Correct AnswerverifiedShow Answer

Pillow lavas are _______.

Correct AnswerverifiedC

Compare and contrast the following: shield volcanoes, composite cones/stratovolcanoes, and cinder cones.

Correct AnswerverifiedStudents should note that while all of t...View AnswerShow Answer

A volcanic deposit comprised of red to black lapilli- sized pyroclastic material associated with pahoehoe lava flows was probably deposited on_______ .

Correct AnswerverifiedC

The Columbia Plateau in the northwestern United States is an excellent example of_______ .

Correct AnswerverifiedShow Answer

Section 6.5 of the chapter notes that most shield volcanoes begin as seamounts and grow from there. What is the driving force behind this action?

Correct AnswerverifiedShow Answer

Volcano A erupts rocks with SiO2 content ranging from 49% to 52% whereas volcano B, 100km away, erupts materials with SiO2 content of 62- 68%. Which statement best characterizes these two volcanoes?

Correct AnswerverifiedShow Answer

Examine the words and/or phrases below and determine the relationship among the majority of words/phrases. Choose the option which does not fit the pattern.

Correct AnswerverifiedShow Answer

Kilauea is an example of a _______.

Correct AnswerverifiedShow Answer

Which of the following volcano types are short lived volcanoes that last a few days to months and then shut down?

Correct AnswerverifiedShow Answer

When Mt. St. Helens erupted in May of 1980, ash blew as far away as _______.

Correct AnswerverifiedShow Answer

Volcanic bombs originate_______ .

Correct AnswerverifiedShow Answer

Which type of basaltic lava flow has its surface covered with sharp- edged, angular blocks and rubble?

Correct AnswerverifiedShow Answer

Which one of the following statements concerning cinder cones is false?

Correct AnswerverifiedShow Answer

Match the letter on the figure with the term. -Identify what letter E represents in the diagram.

Correct AnswerverifiedShow Answer

The higher the viscosity of a magma, the _______the potential for explosive eruptions.

Correct AnswerverifiedShow Answer

Which type of plate margin is characterized by volcanoes that include basalt, andesite, dacite and rhyolite?

Correct AnswerverifiedShow Answer

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C

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Students should note that while all of t...
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C

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Volcano A erupts rocks with SiO₂content ranging from 49% to 52% whereas volcano B, 100km away, erupts materials with SiO₂content of 62- 68%. Which statement best characterizes these two volcanoes?

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