Question 1

All active volcanoes on land are located along the Ring of Fire.

Accepted Answer

A) True 
 B)False

Question 2

The two primary volcanic gases are

Accepted Answer

A)   hydrogen sulfide and carbon monoxide.
B)   carbon monoxide and carbon dioxide.
C)   chlorine gas and carbon monoxide.
D)   carbon dioxide and water vapour.
E)   chlorine gas and hydrogen sulfide.F) D) and E)
G) A) and B)

Question 3

Shield volcanoes commonly erupt tephra.

Accepted Answer

A) True 
 B)False

Question 4

Explain how a mantle hotspot is responsible for the Hawaiian islands.

Accepted Answer

The hotspot is stationary in the mantle,...

Question 5

Which of the following volcanic products is most hazardous to air traffic?

Accepted Answer

A)   pyroclastic flows
B)   volcanic ash
C)   lahars
D)   volcanic bombs
E)   lava flowsF) B) and D)
G) C) and D)

Question 6

Discuss the role of education and experience in decreasing fatalities from volcanic hazards.

Accepted Answer

People live near volcanoes for many reas...

Question 7

What is the Volcanic Explosivity Index? What factors contribute to it?

Accepted Answer

The VEI is a measure of the si...

Question 8

Which of the following eruptions had the highest Volcanic Explosivity Index?

Accepted Answer

A)   Mount St. Helens, 1980
B)   Mt. Pinatubo, 1991
C)   Kilauea, 2007
D)   Yellowstone caldera, 600,000 years ago
E)   Mt. Unzen, 1991F) A) and B)
G) B) and D)

Question 9

Silica-rich magmas are noted for their high viscosity,which results in slow moving lava flows and highly explosive eruptions.

Accepted Answer

A) True 
 B)False

Question 10

How did the Toba caldera eruption impact human populations?

Accepted Answer

The huge amount of pyroclastic material ...

Question 11

A group of volcanoes in central British Columbia extends from west to east,growing progressively older to the west.The youngest volcano (at the east end) is about 8 thousand years old.This age progression implies that movement of the North American Plate in this region has been to the

Accepted Answer

A)   west.
B)   east.
C)   northwest.
D)   northeast.
E)   southwest.F) B) and C)
G) All of the above

Question 12

What is the difference between a hot spring and a geyser?

Accepted Answer

Hot springs occur when groundwater is ci...

Question 13

Why is the lava that erupts at mid-ocean ridges all basaltic,showing little variation worldwide?

Accepted Answer

Magma at mid-ocean ridges forms from ris...

Question 14

Composite volcanoes are both scenic and deadly.What factors contribute to this?

Accepted Answer

Composite volcanoes are built up from hi...

Question 15

Which of the following is considered a secondary effect of volcanic eruption?

Accepted Answer

A)   pyroclastic flow
B)   lahar
C)   pyroclastic surge
D)   poisonous gas
E)   ash fallF) A) and E)
G) A) and B)

Question 16

Explain the process of fractionation,which produces magmas of different compositions.

Accepted Answer

As magma cools,the first minerals to cry...

Question 17

The Nevado del Ruiz Volcanic disaster,which killed over 23,000 people,was due largely to this type of secondary effect.

Accepted Answer

A)   poisonous gas
B)   landslide
C)   fire
D)   tsunami
E)   laharF) A) and C)
G) C) and D)

Question 18

The viscosity of magma or lava is largely based on its ________ content.

Accepted Answer

A)   sodium
B)   silica
C)   calcium
D)   magnesium
E)   ironF) A) and D)
G) B) and E)

Question 19

Lapilli are larger than volcanic bombs.

Accepted Answer

A) True 
 B)False

Question 20

What process causes melting of rocks in subduction zones?

Accepted Answer

A)   decompression of the mantle
B)   addition of heat from the subducting plate
C)   addition of water into the mantle from the subducting slab
D)   removal of water from the mantle
E)   convection of the asthenosphereF) A) and E)
G) A) and D)

Exam 5: Volcanoes and Volcanic Eruptions

Why is the lava that erupts at mid-ocean ridges all basaltic,showing little variation worldwide?

Correct AnswerverifiedMagma at mid-ocean ridges forms from ris...View AnswerShow Answer

The two primary volcanic gases are

Correct AnswerverifiedShow Answer

How did the Toba caldera eruption impact human populations?

Correct AnswerverifiedThe huge amount of pyroclastic material ...View AnswerShow Answer

The viscosity of magma or lava is largely based on its ________ content.

Correct AnswerverifiedShow Answer

What is the Volcanic Explosivity Index? What factors contribute to it?

Correct AnswerverifiedThe VEI is a measure of the si...View AnswerShow Answer

What is the difference between a hot spring and a geyser?

Correct AnswerverifiedHot springs occur when groundwater is ci...View AnswerShow Answer

Lapilli are larger than volcanic bombs.

Correct AnswerverifiedShow Answer

What process causes melting of rocks in subduction zones?

Correct AnswerverifiedShow Answer

Shield volcanoes commonly erupt tephra.

Correct AnswerverifiedShow Answer

Composite volcanoes are both scenic and deadly.What factors contribute to this?

Correct AnswerverifiedComposite volcanoes are built up from hi...View AnswerShow Answer

A group of volcanoes in central British Columbia extends from west to east,growing progressively older to the west.The youngest volcano (at the east end) is about 8 thousand years old.This age progression implies that movement of the North American Plate in this region has been to the

Correct AnswerverifiedShow Answer

Which of the following eruptions had the highest Volcanic Explosivity Index?

Correct AnswerverifiedShow Answer

Which of the following is considered a secondary effect of volcanic eruption?

Correct AnswerverifiedShow Answer

All active volcanoes on land are located along the Ring of Fire.

Correct AnswerverifiedShow Answer

Which of the following volcanic products is most hazardous to air traffic?

Correct AnswerverifiedShow Answer

The Nevado del Ruiz Volcanic disaster,which killed over 23,000 people,was due largely to this type of secondary effect.

Correct AnswerverifiedShow Answer

Discuss the role of education and experience in decreasing fatalities from volcanic hazards.

Correct AnswerverifiedPeople live near volcanoes for many reas...View AnswerShow Answer

Explain the process of fractionation,which produces magmas of different compositions.

Correct AnswerverifiedAs magma cools,the first minerals to cry...View AnswerShow Answer

Explain how a mantle hotspot is responsible for the Hawaiian islands.

Correct AnswerverifiedThe hotspot is stationary in the mantle,...View AnswerShow Answer

Silica-rich magmas are noted for their high viscosity,which results in slow moving lava flows and highly explosive eruptions.

Correct AnswerverifiedShow Answer

Correct Answer
verified
Magma at mid-ocean ridges forms from ris...
View Answer

Correct Answer
verified

Correct Answer
verified
The huge amount of pyroclastic material ...
View Answer

Correct Answer
verified

Correct Answer
verified
The VEI is a measure of the si...
View Answer

Correct Answer
verified
Hot springs occur when groundwater is ci...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Composite volcanoes are built up from hi...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
People live near volcanoes for many reas...
View Answer

Correct Answer
verified
As magma cools,the first minerals to cry...
View Answer

Correct Answer
verified
The hotspot is stationary in the mantle,...
View Answer

Correct Answer
verified