Question 1

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 slower than water.
C)  No,the viscosity of basaltic magma is much higher than water,and thus,would flow much faster 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) A) and D)
F) None of the above

Question 2

What type of volcano would be most likely to generate large landslides?

Accepted Answer

A)  shield volcano
B)  cinder cone
C)  composite volcano
D)  calderaE) A) and B)
F) B) and C)

Question 3

Which of the following best describes Shiprock,a famous volcanic feature in New Mexico?

Accepted Answer

A)  a very recently active,basaltic cinder cone
B)  an extinct,highly symmetrical,composite volcanic cone
C)  the eroded remains of a volcanic pipe and radiating dikes
D)  an extinct,massive,rhyolitic shield volcanoE) B) and C)
F) A) and B)

Question 4

Paricutin is an example of a ________.

Accepted Answer

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

Question 5

Where are the most active volcanoes in the world?

Accepted Answer

A)  Washington State,in the United States
B)  Mexico
C)  Italy
D)  HawaiiE) C) and D)
F) A) and C)

Question 6

Pillow lavas are basaltic magmas extruded as piles of bombs that accumulate in piles of rocks that look like a pile of pillows.

Accepted Answer

A) True 
 B)False

Question 7

________ magma is the most abundant type of magma erupted on Earth.

Accepted Answer

A)  Basaltic
B)  Granitic
C)  Andesitic
D)  PegmatiticE) C) and D)
F) A) and B)

Question 8

Mt.Rainier in Washington State is often thought to be the most hazardous volcano in the lower 48 states of the United States because ________.

Accepted Answer

A)  it is close enough to Seattle and Tacoma,Washington that these cities could be destroyed in a pyroclastic flow
B)  the volcano is close enough to Seattle and Tacoma,Washington that a large explosive eruption could bury the cities in a large rock avalanche similar to the Mt.St.Helens eruption
C)  large amounts of glacial ice on the mountain could be melted by even a small eruption,potentially generating dangerous lahars that would travel rapidly down river valleys to heavily populated areas
D)  The statement is false; the volcano poses little hazard to humans except for the few who live close to the volcano.E) A) and D)
F) All of the above

Question 9

Briefly summarize at least 4 major volcanic hazards.Describe the level of risk from most dangerous to least dangerous to human life.For each hazard indicate where the hazard is located relative to the volcano (on the volcano slopes,anywhere within several km of the volcano,anywhere within thousands of km of the volcano,in river valleys near the volcano,near bodies of water near the volcano,etc.)and consider if the probability of the hazard is very low,low,medium,high,or high,within the danger zone of the hazard.

Accepted Answer

Question undoubtedly has range of answer...

Question 10

Many magmas are generated when solid rocks are carried to higher levels in the earth by flow and partially melted by decompression melting.

Accepted Answer

A) True 
 B)False

Question 11

Pillow lavas are ________.

Accepted Answer

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

Question 12

Which of the following is not a significant volcanic hazard?

Accepted Answer

A)  injury or death by inhalation of air heavily laden with volcanic ash
B)  being overrun by a fast moving basaltic lava flow
C)  being caught in a river valley and being overcome by a volcanic mudflow/lahar
D)  a tsunami generated by a massive submarine volcanic eruptionE) All of the above
F) B) and C)

Question 13

Match the name of the tectonic feature with the Figure. 
-oceanic spreading center

Accepted Answer

The answer of Match the name of the tectonic feature...

Question 14

Which one of the following statements concerning volcanic blocks and bombs is true?

Accepted Answer

A)  Blocks are broken fragments of solid rocks; bombs have smaller sizes than lapilli.
B)  Bombs are guided to Earth by laser beams; blocks fall anywhere.
C)  Bombs are ejected as magma lumps; blocks are ejected as solid fragments.
D)  Bombs and blocks are both smaller than lapilli and cinders.E) A) and B)
F) C) and D)

Question 15

the volcanoes of southwestern Alaska and the Aleutian Islands

Accepted Answer

composite/...

Question 16

When magma rises toward the surface,pressure decreases can lead to release of dissolved gases in a magma with a volume increase that can produce an explosion.

Accepted Answer

A) True 
 B)False

Question 17

What volcanic events formed Crater Lake,Oregon? When did they take place?

Accepted Answer

A)  A powerful explosion blew away the top of a stratovolcano 10 million years ago.
B)  The crater of a large,extinct cinder cone filled with water 5 million years ago.
C)  Landslides and volcanic mudflows dammed the Mazama River 500 years ago.
D)  Caldera collapse followed major ash and pyroclastic-flow eruptions 6000 years ago.E) C) and D)
F) B) and C)

Question 18

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

Accepted Answer

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

Question 19

Volcanos have no significant impact on weather and climate.

Accepted Answer

A) True 
 B)False

Question 20

pahoehoe aa volcanic bomb pillow lava

Accepted Answer

The answer of pahoehoe aa volcanic bomb pillow lava...

Exam 9: Volcanoes and Other Igneous Activity

Which of the following best describes Shiprock,a famous volcanic feature in New Mexico?

Correct Answer
verified

Pillow lavas are basaltic magmas extruded as piles of bombs that accumulate in piles of rocks that look like a pile of pillows.

Correct Answer
verified

What volcanic events formed Crater Lake,Oregon? When did they take place?

Correct Answer
verified

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 Answer
verified

Mt.Rainier in Washington State is often thought to be the most hazardous volcano in the lower 48 states of the United States because ________.

Correct Answer
verified

the volcanoes of southwestern Alaska and the Aleutian Islands

Correct Answer
verified
composite/...
View Answer

Where are the most active volcanoes in the world?

Correct Answer
verified

Correct Answer
verified
Question undoubtedly has range of answer...
View Answer

________ magma is the most abundant type of magma erupted on Earth.

Correct Answer
verified

Which one of the following statements concerning volcanic blocks and bombs is true?

Correct Answer
verified

Pillow lavas are ________.

Correct Answer
verified

Many magmas are generated when solid rocks are carried to higher levels in the earth by flow and partially melted by decompression melting.

Correct Answer
verified

When magma rises toward the surface,pressure decreases can lead to release of dissolved gases in a magma with a volume increase that can produce an explosion.

Correct Answer
verified

Paricutin is an example of a ________.

Correct Answer
verified

Volcanos have no significant impact on weather and climate.

Correct Answer
verified

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

Correct Answer
verified

pahoehoe aa volcanic bomb pillow lava

Correct Answer
verified

What type of volcano would be most likely to generate large landslides?

Correct Answer
verified

Match the name of the tectonic feature with the Figure. -oceanic spreading center

Correct Answer
verified

Which of the following is not a significant volcanic hazard?

Correct Answer
verified

Exam 9: Volcanoes and Other Igneous Activity

Which of the following best describes Shiprock,a famous volcanic feature in New Mexico?

Correct AnswerverifiedShow Answer

Pillow lavas are basaltic magmas extruded as piles of bombs that accumulate in piles of rocks that look like a pile of pillows.

Correct AnswerverifiedShow Answer

What volcanic events formed Crater Lake,Oregon? When did they take place?

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

Mt.Rainier in Washington State is often thought to be the most hazardous volcano in the lower 48 states of the United States because ________.

Correct AnswerverifiedShow Answer

the volcanoes of southwestern Alaska and the Aleutian Islands

Correct Answerverifiedcomposite/...View AnswerShow Answer

Where are the most active volcanoes in the world?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedQuestion undoubtedly has range of answer...View AnswerShow Answer

________ magma is the most abundant type of magma erupted on Earth.

Correct AnswerverifiedShow Answer

Which one of the following statements concerning volcanic blocks and bombs is true?

Correct AnswerverifiedShow Answer

Pillow lavas are ________.

Correct AnswerverifiedShow Answer

Many magmas are generated when solid rocks are carried to higher levels in the earth by flow and partially melted by decompression melting.

Correct AnswerverifiedShow Answer

When magma rises toward the surface,pressure decreases can lead to release of dissolved gases in a magma with a volume increase that can produce an explosion.

Correct AnswerverifiedShow Answer

Paricutin is an example of a ________.

Correct AnswerverifiedShow Answer

Volcanos have no significant impact on weather and climate.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

pahoehoe aa volcanic bomb pillow lava

Correct AnswerverifiedShow Answer

What type of volcano would be most likely to generate large landslides?

Correct AnswerverifiedShow Answer

Match the name of the tectonic feature with the Figure. -oceanic spreading center

Correct AnswerverifiedShow Answer

Which of the following is not a significant volcanic hazard?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
verified
composite/...
View Answer

Correct Answer
verified

Correct Answer
verified
Question undoubtedly has range of answer...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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