Question 1

Which statement about the May, 1980, eruption of Mount St. Helens is false?

Accepted Answer

A)   During the eruptive period, the mountain peak was substantially built up by new lava flows and pyroclastic debris.
B)   Plumes of ash rose high into the atmosphere during the major eruptive events.
C)   Mudflows accompanied the major eruptive events.
D)   The most powerful explosive event was preceded by a massive landslide.

Question 2

Magma generation at depth almost always involves partial melting, not complete melting of the source rock.

Accepted Answer

A) True 
 B)False

Question 3

________ tend to increase the explosive potential of a magma body beneath a volcano.

Accepted Answer

A)   High viscosity and dissolved gas
B)   High viscosity, low dissolved gas content
C)   Low silica content, low viscosity
D)   Low viscosity, low dissolved gas content

Question 4

The most violent volcanic activity is associated with ________.

Accepted Answer

A)   fissure eruptions
B)   shield volcanoes
C)   cinder cones
D)   composite cones

Question 5

Which of the following statements best describes the big Hawaiian volcanoes?

Accepted Answer

A)   lie directly above a transform plate boundary that cuts deeply into the mantle
B)   lie directly above an active subduction zone where the Pacific plate is sinking into the mantle
C)   lie along the crest of the East Pacific Rise, a mid-ocean ridge or spreading center
D)   are situated in the interior of a large, Pacific plate above a hot spot deep in the mantle

Question 6

Which kind of eruptive activity is most likely to be highly explosive?

Accepted Answer

A)   lava flows from a large shield volcano on an oceanic island
B)   fissure eruptions feeding lava to flood basalt accumulations
C)   eruptions of big, continental margin, composite cones or stratovolcanoes
D)   lava flows from a large cinder cone complex

Question 7

What type of volcano is shown in the diagram below?

Accepted Answer

The answer of What type of volcano is shown in...

Question 8

Vents that emit only hot gases and vapors are called ________.

Accepted Answer

The answer of Vents that emit only hot gases and...

Question 9

Which of the following is NOT considered pyroclastic debris?

Accepted Answer

A)   ash
B)   cinders
C)   bombs
D)   pahoehoe

Question 10

Which tabular, discordant igneous rock body intrudes along a crack or fissure?

Accepted Answer

The answer of Which tabular, discordant igneous rock body intrudes...

Question 11

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 neck

Question 12

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 volcano

Question 13

Ash and lapilli are different sized pyroclastic particles.

Accepted Answer

A) True 
 B)False

Question 14

Briefly discuss volcanic hazards. Although commonly thought to be associated with most volcanic eruptions (by the general public), lava is rarely responsible for the loss of life. Which hazards would tend to be more deadly? Finally, indicate those hazards that are a direct result of volcanic activity as well as those hazards that are indirectly linked.

Accepted Answer

Volcanic hazards can include lava flows,...

Question 15

Which of the following factors help determine whether a volcanic eruption will be violent or relatively quiescent?

Accepted Answer

A)   amount of dissolved gas in the magma
B)   temperature of the magma
C)   composition of the magma
D)   all of these

Question 16

Which kind of volcanism is typical of mid-oceanic ridge systems?

Accepted Answer

A)   explosive; composite cones
B)   submarine; basaltic lava flows
C)   fissure eruptions; flood basalt fields
D)   explosive; rhyolitic, pyroclastic flows

Question 17

Matching.  Please choose from one of the following answers.
-the volcanoes of southwestern Alaska and the Aleutian Islands

Accepted Answer

A)  shield volcanoes
B)  composite/stratovolcanoes
C)  cinder cones

Question 18

Which type of basaltic lava flow has a fairly smooth, unfragmented, ropy surface?

Accepted Answer

A)   aa
B)   pegmatitic
C)   pahoehoe
D)   scoria

Question 19

Composite volcanic cones are also known as ________.

Accepted Answer

The answer of Composite volcanic cones are also known as...

Question 20

Mount St. Helens is ________.

Accepted Answer

A)   a basaltic cinder cone
B)   an explosive stratovolcano
C)   a basaltic shield volcano
D)   a small, welded tuff cone

Exam 9: Volcanoes and Other Igneous Activity

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

Correct Answer
verified

Which tabular, discordant igneous rock body intrudes along a crack or fissure?

Correct Answer
verified

Ash and lapilli are different sized pyroclastic particles.

Correct Answer
verified

Which of the following factors help determine whether a volcanic eruption will be violent or relatively quiescent?

Correct Answer
verified

Which of the following statements best describes the big Hawaiian volcanoes?

Correct Answer
verified

Which type of basaltic lava flow has a fairly smooth, unfragmented, ropy surface?

Correct Answer
verified

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

Correct Answer
verified

Which kind of eruptive activity is most likely to be highly explosive?

Correct Answer
verified

Which kind of volcanism is typical of mid-oceanic ridge systems?

Correct Answer
verified

Mount St. Helens is ________.

Correct Answer
verified

Vents that emit only hot gases and vapors are called ________.

Correct Answer
verified

Which of the following is NOT considered pyroclastic debris?

Correct Answer
verified

The most violent volcanic activity is associated with ________.

Correct Answer
verified

Which statement about the May, 1980, eruption of Mount St. Helens is false?

Correct Answer
verified

What type of volcano is shown in the diagram below?

Correct Answer
verified

Matching. Please choose from one of the following answers. -the volcanoes of southwestern Alaska and the Aleutian Islands

Correct Answer
verified

Magma generation at depth almost always involves partial melting, not complete melting of the source rock.

Correct Answer
verified

________ tend to increase the explosive potential of a magma body beneath a volcano.

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
Volcanic hazards can include lava flows,...
View Answer

Composite volcanic cones are also known as ________.

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

Which tabular, discordant igneous rock body intrudes along a crack or fissure?

Correct AnswerverifiedShow Answer

Ash and lapilli are different sized pyroclastic particles.

Correct AnswerverifiedShow Answer

Which of the following factors help determine whether a volcanic eruption will be violent or relatively quiescent?

Correct AnswerverifiedShow Answer

Which of the following statements best describes the big Hawaiian volcanoes?

Correct AnswerverifiedShow Answer

Which type of basaltic lava flow has a fairly smooth, unfragmented, ropy surface?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which kind of eruptive activity is most likely to be highly explosive?

Correct AnswerverifiedShow Answer

Which kind of volcanism is typical of mid-oceanic ridge systems?

Correct AnswerverifiedShow Answer

Mount St. Helens is ________.

Correct AnswerverifiedShow Answer

Vents that emit only hot gases and vapors are called ________.

Correct AnswerverifiedShow Answer

Which of the following is NOT considered pyroclastic debris?

Correct AnswerverifiedShow Answer

The most violent volcanic activity is associated with ________.

Correct AnswerverifiedShow Answer

Which statement about the May, 1980, eruption of Mount St. Helens is false?

Correct AnswerverifiedShow Answer

What type of volcano is shown in the diagram below?

Correct AnswerverifiedShow Answer

Matching. Please choose from one of the following answers. -the volcanoes of southwestern Alaska and the Aleutian Islands

Correct AnswerverifiedShow Answer

Magma generation at depth almost always involves partial melting, not complete melting of the source rock.

Correct AnswerverifiedShow Answer

________ tend to increase the explosive potential of a magma body beneath a volcano.

Correct AnswerverifiedShow Answer

Correct AnswerAnswered by ExamLex AIVolcanic hazards can include lava flows,...View AnswerShow Answer

Composite volcanic cones are also known as ________.

Correct AnswerverifiedShow Answer

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
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
Volcanic hazards can include lava flows,...
View Answer

Correct Answer
verified