Question 1

Which of the following best describes the temperature of materials typically erupted from volcanoes?

Accepted Answer

A)  Extremely hot 
B)  Warm to slighty hot 
C)  Cool to cold 
A)  Extremely hot 
B)  Warm to slighty hot 
C)  Cool to cold

Question 2

Which of the following is least likely to be a volcano?

Accepted Answer

A)  a vent where magma and other volcanic material is erupted 
B)  a hill with a crater formed at the site of an eruption 
C)  a hill capped by volcanic rocks 
D)  a fissure that erupts hot, molten lava 
E)  a mountain that erupts only volcanic ash 
A)  a vent where magma and other volcanic material is erupted 
B)  a hill with a crater formed at the site of an eruption 
C)  a hill capped by volcanic rocks 
D)  a fissure that erupts hot, molten lava 
E)  a mountain that erupts only volcanic ash

Question 3

Which of the following volcanoes is generally the largest?

Accepted Answer

A)  scoria cone 
B)  dome 
C)  composite volcano 
D)  shield volcano 
A)  scoria cone 
B)  dome 
C)  composite volcano 
D)  shield volcano

Question 4

Which of the following is NOT a reason why heat flow and gas output from a volcano tend to increase before eruptions?

Accepted Answer

A)  Melting of snow caps dissolves large amounts of water into the magma 
B)  Pressure decreases in rising magma, promoting gas release 
C)  Approach of hot magma to the surface warms the rocks within the volcano 
A)  Melting of snow caps dissolves large amounts of water into the magma 
B)  Pressure decreases in rising magma, promoting gas release 
C)  Approach of hot magma to the surface warms the rocks within the volcano

Question 5

Which site on the island has evidence for collapse of a volcanic dome?

Accepted Answer

A)  the location of Rock 1 
B)  the location of Rock 2 
C)  the location of Rock 3 
D)  the area of the landslide blocks 
E)  the area of the mudflow deposits 
A)  the location of Rock 1 
B)  the location of Rock 2 
C)  the location of Rock 3 
D)  the area of the landslide blocks 
E)  the area of the mudflow deposits

Question 6

Which of the following is common in lava flows associated with scoria cones?

Accepted Answer

A)  Some scoria cones are not accompanied by a lava flow and vice versa. 
B)  Some lava flows squeeze out near the base of the scoria cone. 
C)  The lava flow forms before the scoria cone when gas contents are highest. 
D)  The lava flows are mostly intermediate to felsic. 
E)  a and b only 
A)  Some scoria cones are not accompanied by a lava flow and vice versa. 
B)  Some lava flows squeeze out near the base of the scoria cone. 
C)  The lava flow forms before the scoria cone when gas contents are highest. 
D)  The lava flows are mostly intermediate to felsic. 
E)  a and b only

Question 7

The eruption that occurred on Mount St. Helens was triggered by:

Accepted Answer

A)  A huge landslide caused a lateral blast that knocked down trees and buildings. 
B)  A fast-moving viscous lava flow flowed through the middle of Portland. 
C)  A volcano that was so heavy that it caused part of the island to collapse. 
D)  A scoria cone that sent up a large column of pyroclastic material. 
E)  None of these. 
A)  A huge landslide caused a lateral blast that knocked down trees and buildings. 
B)  A fast-moving viscous lava flow flowed through the middle of Portland. 
C)  A volcano that was so heavy that it caused part of the island to collapse. 
D)  A scoria cone that sent up a large column of pyroclastic material. 
E)  None of these.

Question 8

Which of the following is NOT a rock typically found within calderas?

Accepted Answer

A)  gabbro 
B)  tuff 
C)  welded rhyolite 
D)  granite 
A)  gabbro 
B)  tuff 
C)  welded rhyolite 
D)  granite

Question 9

How many people were killed by the 1883 eruption of Krakatau, Indonesia?

Accepted Answer

A)  Almost 4,000 
B)  Almost 40,000 
C)  Almost 400,000 
D)  Almost 4,000,000 
A)  Almost 4,000 
B)  Almost 40,000 
C)  Almost 400,000 
D)  Almost 4,000,000

Question 10

What types of rocks would be common in the volcano in this figure?

Accepted Answer

A)  welded tuff 
B)  felsic and intermediate lava flows 
C)  nonwelded tuff 
D)  volcanic domes 
E)  all of these 
A)  welded tuff 
B)  felsic and intermediate lava flows 
C)  nonwelded tuff 
D)  volcanic domes 
E)  all of these

Question 11

Shield volcanoes are composed primarily of:

Accepted Answer

A)  basalt lava flows 
B)  andesite lava flows 
C)  rhyolite lava flows 
A)  basalt lava flows 
B)  andesite lava flows 
C)  rhyolite lava flows

Question 12

The main cause of caldera collapse is:

Accepted Answer

A)  a fissure eruption that allows the shield volcano to split into two or more parts 
B)  collapse of the north flank by landslides 
C)  removal of magmas that form pillow basalt 
D)  collapse of the roof of a magma chamber as magma erupts 
E)  all of these 
A)  a fissure eruption that allows the shield volcano to split into two or more parts 
B)  collapse of the north flank by landslides 
C)  removal of magmas that form pillow basalt 
D)  collapse of the roof of a magma chamber as magma erupts 
E)  all of these

Question 13

Which of the following is a recognizable characteristic of recent calderas?

Accepted Answer

A)  Steep-sided basin-shaped depression 
B)  Large, conical mountain form 
C)  Long, narrow valley 
A)  Steep-sided basin-shaped depression 
B)  Large, conical mountain form 
C)  Long, narrow valley

Question 14

Which of the following is NOT a typical hazard posed to human-made structures by lava flows?

Accepted Answer

A)  burning 
B)  high winds 
C)  crushing 
D)  burying 
A)  burning 
B)  high winds 
C)  crushing 
D)  burying

Question 15

Which of the following are dangerous aspects of composite volcanoes?

Accepted Answer

A)  pyroclastic flows 
B)  landslides and mudflows 
C)  an eruption column 
D)  all of these 
A)  pyroclastic flows 
B)  landslides and mudflows 
C)  an eruption column 
D)  all of these

Question 16

Which of the following is a hazard but not a risk, according to the textbook?

Accepted Answer

A)  the Kilauea volcano, which covers subdivisions with molten lava 
B)  a scoria cone that erupts hot molten fragments on an unpopulated Pacific island 
C)  a volcano in Iceland that threatens people with dangerous gases 
D)  a volcano in Iceland that caused catastrophic flooding that destroyed houses and roads 
E)  all of these are both a hazard and a risk 
A)  the Kilauea volcano, which covers subdivisions with molten lava 
B)  a scoria cone that erupts hot molten fragments on an unpopulated Pacific island 
C)  a volcano in Iceland that threatens people with dangerous gases 
D)  a volcano in Iceland that caused catastrophic flooding that destroyed houses and roads 
E)  all of these are both a hazard and a risk

Question 17

What types of rocks would be most common in the small volcano in this photograph?

Accepted Answer

A)  scoria and other vesicular basalt 
B)  basalt mostly formed in lava flows 
C)  felsic and intermediate lava flows 
D)  welded tuff and tephra 
E)  none of these 
A)  scoria and other vesicular basalt 
B)  basalt mostly formed in lava flows 
C)  felsic and intermediate lava flows 
D)  welded tuff and tephra 
E)  none of these

Question 18

What type of eruption is shown in this photograph?

Accepted Answer

A)  lava flow 
B)  lava dome 
C)  lava fountain 
D)  pyroclastic column 
E)  pyroclastic flow 
A)  lava flow 
B)  lava dome 
C)  lava fountain 
D)  pyroclastic column 
E)  pyroclastic flow

Question 19

Which of the following are true of felsic magmas?

Accepted Answer

A)  They tend to have high viscosities. 
B)  They do not allow gas bubbles to escape easily 
C)  High gas pressures commonly lead to highly explosive eruptions. 
D)  All of these 
A)  They tend to have high viscosities. 
B)  They do not allow gas bubbles to escape easily 
C)  High gas pressures commonly lead to highly explosive eruptions. 
D)  All of these

Question 20

Which of the numbered features is a pyroclastic flow?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Which of the following best describes the temperature of materials typically erupted from volcanoes?

Which of the following is least likely to be a volcano?

Which of the following volcanoes is generally the largest?

Which of the following is NOT a reason why heat flow and gas output from a volcano tend to increase before eruptions?

Which site on the island has evidence for collapse of a volcanic dome?

Which of the following is common in lava flows associated with scoria cones?

The eruption that occurred on Mount St. Helens was triggered by:

Which of the following is NOT a rock typically found within calderas?

How many people were killed by the 1883 eruption of Krakatau, Indonesia?

What types of rocks would be common in the volcano in this figure?

Shield volcanoes are composed primarily of:

The main cause of caldera collapse is:

Which of the following is a recognizable characteristic of recent calderas?

Which of the following is NOT a typical hazard posed to human-made structures by lava flows?

Which of the following are dangerous aspects of composite volcanoes?

Which of the following is a hazard but not a risk, according to the textbook?

What types of rocks would be most common in the small volcano in this photograph?

What type of eruption is shown in this photograph?

Which of the following are true of felsic magmas?

Which of the numbered features is a pyroclastic flow?

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Exam 6: Volcanoes and Volcanic Hazards

Which of the following best describes the temperature of materials typically erupted from volcanoes?

Which of the following is least likely to be a volcano?

Which of the following volcanoes is generally the largest?

Which of the following is NOT a reason why heat flow and gas output from a volcano tend to increase before eruptions?

Which site on the island has evidence for collapse of a volcanic dome?

Which of the following is common in lava flows associated with scoria cones?

The eruption that occurred on Mount St. Helens was triggered by:

Which of the following is NOT a rock typically found within calderas?

How many people were killed by the 1883 eruption of Krakatau, Indonesia?

What types of rocks would be common in the volcano in this figure?

Shield volcanoes are composed primarily of:

The main cause of caldera collapse is:

Which of the following is a recognizable characteristic of recent calderas?

Which of the following is NOT a typical hazard posed to human-made structures by lava flows?

Which of the following are dangerous aspects of composite volcanoes?

Which of the following is a hazard but not a risk, according to the textbook?

What types of rocks would be most common in the small volcano in this photograph?

What type of eruption is shown in this photograph?

Which of the following are true of felsic magmas?

Which of the numbered features is a pyroclastic flow?

The Nature of Geology

Investigating Geologic Questions

Plate Tectonics

Earth Materials

Igneous Environments

Sedimentary Environments

Deformation and Metamorphism

Geologic Time

Seafloor and Continental Margins

Mountains, Basins, and Continents

Earthquakes and Earths Interior

Climate and Weathering

Glaciers, Shorelines, and Changing Sea Levels

Weathering, Soil, and Unstable Slopes

Streams and Flooding

Water Resources

Energy and Mineral Resources

Geology of the Solar System

Filters