Question 1

In the United States,there was great concern in the early 1980s when earthquakes were frequent,including harmonic tremor,and four magnitude 6 earthquakes caused damage near this volcanic center.

Accepted Answer

A)  Long Valley caldera in California
B)  Valles caldera in New Mexico
C)  Yellowstone National Park,Wyoming
D)  Mt.St.Helens,Washington
E)  Crater Lake,OregonF) A) and D)
G) B) and D)

Question 2

The Pacific Northwest of the United States (Washington and Oregon)has long-term risk for both explosive volcanic eruptions and a moment-magnitude earthquake of around 9.

Accepted Answer

A) True 
 B)False  True

Question 3

The plate-tectonic process responsible for volcanoes in the Pacific Northwest region of North America is identical to the cause of the region's great earthquakes-subduction of the Juan de Fuca plate.

Accepted Answer

A) True 
 B)False

Question 4

In 1883,Edvard Munch created his famous painting The Scream after witnessing a blood red sky over Oslo,Norway,caused by the eruption of _________.

Accepted Answer

A)  Laki Volcano,Iceland
B)  Vesuvius Volcano,Italy
C)  Tambora Volcano,Indonesia
D)  Krakatau Volcano,Indonesia
E)  Pinatubo Volcano,PhilippinesF) A) and B)
G) A) and C)

Question 5

In Icelandic-type eruptions,low viscosity,low-volatile content lava erupts peacefully.

Accepted Answer

A) True 
 B)False  True

Question 6

At Lake Nyos in 1986,a gas cloud wiped out all plant and animal life,as well as killed 1700 people.

Accepted Answer

A) True 
 B)False

Question 7

The energy behind the 1902 pyroclastic flow that destroyed St.Pierre came from _________________.

Accepted Answer

A)  the blast of the volcano
B)  gravity
C)  gas escaping from pieces of airborne pyroclastic material,creating a "popcorn" effect
D)  All of the choices are correct.E) A) and D)
F) All of the above D

Question 8

In 1973 the town of Vestmannaeyjar on the island of Heimaey (off the coast of Iceland),was devastated by pyroclastic flows which completely filled and closed the town's harbor.

Accepted Answer

A) True 
 B)False

Question 9

The two most active Cascade Range volcanoes over the past 4000 years are _______________.

Accepted Answer

A)  Mt.Rainier and Mt.Adams
B)  Mt.Shasta and Mt.Jefferson
C)  Mt.Baker and Mt.Hood
D)  Mt.St.Helens and Mt.Shasta
E)  Lassen Peak and Newberry VolcanoF) None of the above
G) A) and B)

Question 10

Active volcanoes today in Oregon and Washington,including Mt.St.Helens,result from _________________.

Accepted Answer

A)  heat generated by friction on the San Andreas Fault
B)  the subduction of the Juan de Fuca plate beneath North America
C)  The subduction of the Pacific plate beneath North America
D)  spreading of the Juan de Fuca ridge
E)  continent-continent collisionF) A) and E)
G) C) and D)

Question 11

Several geologic phenomena are being studied as signs of an impending volcanic eruption.These include seismic waves,______________,and the release of gases.

Accepted Answer

A)  ground deformation
B)  flash floods
C)  landslides
D)  hymenoptra behavior
E)  unusual animal behaviorF) None of the above
G) All of the above

Question 12

At Mt.St.Helens,about 60 people were killed in 1980,primarily by pyroclastic flows and effects related to lateral blast.

Accepted Answer

A) True 
 B)False

Question 13

The largest lava dome known is Mt.Lassen,California.

Accepted Answer

A) True 
 B)False

Question 14

On 8 May 1902,a massive eruption of this volcano killed 30,000 people in the town of St.Pierre.The volcano was _______________________.

Accepted Answer

A)  Mont Pelée,Martinique
B)  Vesuvius,Italy
C)  Krakatau,Indonesia
D)  Mt.St.Helens,Washington
E)  Nevado Del Ruiz,ColombiaF) All of the above
G) A) and B)

Question 15

Ways of generating pyroclastic flows include ______________.

Accepted Answer

A)  dome collapse as at Mt.Unzen,1991
B)  overspilling of crater rim as at Mont Pelée,1902-1903
C)  directed blast as at Mt.St.Helens,1980,and Mt.Pinatubo,1991
D)  eruption column collapse at Mt.Mayon
E)  All of the choices are correct.F) A) and B)
G) A) and C)

Question 16

The eruption of Mt.Pinatubo in 1991 endangered people,animals,and property because of __________________.

Accepted Answer

A)  massive lava flows
B)  lahars and pyroclastic flows
C)  acid rain
D)  pelting lapili
E)  poisonous gasesF) C) and E)
G) B) and E)

Question 17

During the 1990's,hundreds of trees were killed at Mammoth Mountain,California,by the diffuse emission of _________ gas.

Accepted Answer

A)  O2
B)  SiO2
C)  CO
D)  CO2
E)  H2SF) C) and D)
G) B) and E)

Question 18

Many of the deaths at Mt.St.Helens on May 18,1980 were related to ________________.

Accepted Answer

A)  the earthquake that preceded the eruption
B)  people being overcome by fast-flowing basaltic lava
C)  ash fall hundreds of miles away
D)  suffocation from a carbon dioxide cloud
E)  the effects of lateral blastF) A) and E)
G) B) and C)

Question 19

Pyroclastic flows cannot travel down all sides of a volcano simultaneously.

Accepted Answer

A) True 
 B)False

Question 20

In August 1986,a gigantic volume of gas belched forth from Lake Nyos in Cameroon and swept down the adjacent valleys asphyxiating 1700 people.The gas was _____________.

Accepted Answer

A)  sulfur dioxide
B)  carbon dioxide
C)  hydrogen sulfide
D)  carbon monoxide
E)  super heated H2OF) B) and E)
G) A) and C)

Exam 7: Volcano Processes and Deadly Events

In the United States,there was great concern in the early 1980s when earthquakes were frequent,including harmonic tremor,and four magnitude 6 earthquakes caused damage near this volcanic center.

Correct AnswerverifiedShow Answer

The Pacific Northwest of the United States (Washington and Oregon)has long-term risk for both explosive volcanic eruptions and a moment-magnitude earthquake of around 9.

Correct AnswerverifiedTrue

The plate-tectonic process responsible for volcanoes in the Pacific Northwest region of North America is identical to the cause of the region's great earthquakes-subduction of the Juan de Fuca plate.

Correct AnswerverifiedShow Answer

In 1883,Edvard Munch created his famous painting The Scream after witnessing a blood red sky over Oslo,Norway,caused by the eruption of _________.

Correct AnswerverifiedShow Answer

In Icelandic-type eruptions,low viscosity,low-volatile content lava erupts peacefully.

Correct AnswerverifiedTrue

At Lake Nyos in 1986,a gas cloud wiped out all plant and animal life,as well as killed 1700 people.

Correct AnswerverifiedShow Answer

The energy behind the 1902 pyroclastic flow that destroyed St.Pierre came from _________________.

Correct AnswerverifiedD

In 1973 the town of Vestmannaeyjar on the island of Heimaey (off the coast of Iceland),was devastated by pyroclastic flows which completely filled and closed the town's harbor.

Correct AnswerverifiedShow Answer

The two most active Cascade Range volcanoes over the past 4000 years are _______________.

Correct AnswerverifiedShow Answer

Active volcanoes today in Oregon and Washington,including Mt.St.Helens,result from _________________.

Correct AnswerverifiedShow Answer

Several geologic phenomena are being studied as signs of an impending volcanic eruption.These include seismic waves,______________,and the release of gases.

Correct AnswerverifiedShow Answer

At Mt.St.Helens,about 60 people were killed in 1980,primarily by pyroclastic flows and effects related to lateral blast.

Correct AnswerverifiedShow Answer

The largest lava dome known is Mt.Lassen,California.

Correct AnswerverifiedShow Answer

On 8 May 1902,a massive eruption of this volcano killed 30,000 people in the town of St.Pierre.The volcano was _______________________.

Correct AnswerverifiedShow Answer

Ways of generating pyroclastic flows include ______________.

Correct AnswerverifiedShow Answer

The eruption of Mt.Pinatubo in 1991 endangered people,animals,and property because of __________________.

Correct AnswerverifiedShow Answer

During the 1990's,hundreds of trees were killed at Mammoth Mountain,California,by the diffuse emission of _________ gas.

Correct AnswerverifiedShow Answer

Many of the deaths at Mt.St.Helens on May 18,1980 were related to ________________.

Correct AnswerverifiedShow Answer

Pyroclastic flows cannot travel down all sides of a volcano simultaneously.

Correct AnswerverifiedShow Answer

In August 1986,a gigantic volume of gas belched forth from Lake Nyos in Cameroon and swept down the adjacent valleys asphyxiating 1700 people.The gas was _____________.

Correct AnswerverifiedShow Answer

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