Question 1

Volcanoes that build domes are more likely to erupt explosively than are shield volcanoes.

Accepted Answer

A) True 
 B)False  True

Question 2

Increased thermal activity (fumaroles,hot springs)in a volcanic area may signal the presence of hot magma at shallow depths in the crust.

Accepted Answer

A) True 
 B)False  True

Question 3

Eruption of magma from a long crack in the lithosphere is a

Accepted Answer

A)  Pyroclastic eruption. 
B)  Nuée ardente. 
C)  Fissure eruption. 
D)  Cascade volcano. 
A)  Pyroclastic eruption. 
B)  Nuée ardente. 
C)  Fissure eruption. 
D)  Cascade volcano. C

Question 4

A volcanic rock of intermediate composition,characteristic of subduction-zone volcanoes like those of the Cascade Range is

Accepted Answer

A)  Basalt. 
B)  Andesite. 
C)  Rhyolite. 
D)  Granite. 
A)  Basalt. 
B)  Andesite. 
C)  Rhyolite. 
D)  Granite.

Question 5

Pyroclastics

Accepted Answer

A)  Represent the fluid portion of lavas. 
B)  Are solid materials erupted from a volcano. 
C)  Are smaller volcanos that develop on the sides of a main volcano. 
D)  Are researchers who study volcanos and volcanic processes. 
A)  Represent the fluid portion of lavas. 
B)  Are solid materials erupted from a volcano. 
C)  Are smaller volcanos that develop on the sides of a main volcano. 
D)  Are researchers who study volcanos and volcanic processes.

Question 6

A dormant volcano that is currently inactive could have a potential to possibly become active.

Accepted Answer

A) True 
 B)False

Question 7

Which of the following volcanoes is least likely to erupt violently and explosively?

Accepted Answer

A)  Kilauea on Hawaii 
B)  Mount St. Helens in the Cascades 
C)  Mount Augustine in the Aleutians 
D)  Mt. Pinatubo in the Philippines 
A)  Kilauea on Hawaii 
B)  Mount St. Helens in the Cascades 
C)  Mount Augustine in the Aleutians 
D)  Mt. Pinatubo in the Philippines

Question 8

A caldera is

Accepted Answer

A)  A topographically low area that results from the collapse of a volcano after its magma chamber empties or removal of the top of a volcano during an explosive eruption. 
B)  An alternate name for boiling mud pots in thermally active areas. 
C)  Not associated with andesitic or rhyolitic volcanism, but only with basaltic volcanism. 
D)  Only preserved for short periods of time, so that ancient calderas do not exist. 
A)  A topographically low area that results from the collapse of a volcano after its magma chamber empties or removal of the top of a volcano during an explosive eruption. 
B)  An alternate name for boiling mud pots in thermally active areas. 
C)  Not associated with andesitic or rhyolitic volcanism, but only with basaltic volcanism. 
D)  Only preserved for short periods of time, so that ancient calderas do not exist.

Question 9

A hot,glowing cloud of gas and ash is sometimes known as a

Accepted Answer

A)  Nuée ardente. 
B)  Lahar. 
C)  Rhyolite. 
D)  Composite flow. 
A)  Nuée ardente. 
B)  Lahar. 
C)  Rhyolite. 
D)  Composite flow.

Question 10

Volcanic ash from recent eruptions of Aleutian volcanoes has posed a threat to air travel.

Accepted Answer

A) True 
 B)False

Question 11

Volcanic rocks are

Accepted Answer

A)  Crystallized from magma at or near the earth's surface. 
B)  By definition, only those produced by conelike volcanic structures. 
C)  Coarse-grained because the magmas typically spend so long inside the volcano before eruption. 
D)  All of the choices are correct. 
A)  Crystallized from magma at or near the earth's surface. 
B)  By definition, only those produced by conelike volcanic structures. 
C)  Coarse-grained because the magmas typically spend so long inside the volcano before eruption. 
D)  All of the choices are correct.

Question 12

People can be killed by poisonous gases emitted by a volcano even before they realize that they are in danger.

Accepted Answer

A) True 
 B)False

Question 13

Strategies for stopping an advancing lava flow include all of the following except

Accepted Answer

A)  Spraying water on the flow front to cool it. 
B)  Constructing a dense, massive plug to stop up the vent from which the magma is erupting. 
C)  Using explosives to punch holes selectively in a flow's hardened crust to divert remaining liquid lava. 
D)  All of these are strategies for stopping an advancing lava flow. 
A)  Spraying water on the flow front to cool it. 
B)  Constructing a dense, massive plug to stop up the vent from which the magma is erupting. 
C)  Using explosives to punch holes selectively in a flow's hardened crust to divert remaining liquid lava. 
D)  All of these are strategies for stopping an advancing lava flow.

Question 14

Active periods in a volcano's history

Accepted Answer

A)  Typically involve only one significant eruptive phase lasting days or, at most, a few weeks. 
B)  Always begin with a nuée ardente. 
C)  May occur at intervals of hundreds or thousands of years, with quiet periods in between. 
D)  All of the choices are correct. 
A)  Typically involve only one significant eruptive phase lasting days or, at most, a few weeks. 
B)  Always begin with a nuée ardente. 
C)  May occur at intervals of hundreds or thousands of years, with quiet periods in between. 
D)  All of the choices are correct.

Question 15

Possible precursors of volcanic eruptions include.

Accepted Answer

A)  Bulging, tilt or uplift of the volcano's surface. 
B)  Increased seismic activity. 
C)  Changes in composition of gases escaping from the volcano. 
D)  All of the choices are correct. 
A)  Bulging, tilt or uplift of the volcano's surface. 
B)  Increased seismic activity. 
C)  Changes in composition of gases escaping from the volcano. 
D)  All of the choices are correct.

Question 16

The Cascade Range volcanoes

Accepted Answer

A)  Sit above a subduction zone. 
B)  Are now expected to become extinct as they cool. 
C)  Pose little threat, as their eruptions are typically quiet ones. 
D)  All of the choices are correct. 
A)  Sit above a subduction zone. 
B)  Are now expected to become extinct as they cool. 
C)  Pose little threat, as their eruptions are typically quiet ones. 
D)  All of the choices are correct.

Question 17

The type of volcano most likely to form over an oceanic "hot spot" is a

Accepted Answer

A)  Composite volcano. 
B)  Volcanic dome. 
C)  Shield volcano. 
D)  Stratovolcano. 
A)  Composite volcano. 
B)  Volcanic dome. 
C)  Shield volcano. 
D)  Stratovolcano.

Question 18

Mount St.Helens and the related Cascade Range volcanoes represent the only volcanically active areas in the United States.

Accepted Answer

A) True 
 B)False

Question 19

Each volcano has a characteristic eruptive style; the nature of past eruptions indicates whether or not a particular volcano is likely to erupt violently in the future.

Accepted Answer

A) True 
 B)False

Question 20

A significant portion of what is erupted by a volcano is gas.Water vapor represents the largest percentage of the total volume of gas erupted.This gas represents the second largest percentage of the total gas volume

Accepted Answer

A)  Sulfur dioxide. 
B)  Nitrogen dioxide. 
C)  Carbon dioxide. 
D)  Carbon monoxide. 
A)  Sulfur dioxide. 
B)  Nitrogen dioxide. 
C)  Carbon dioxide. 
D)  Carbon monoxide.

Volcanoes that build domes are more likely to erupt explosively than are shield volcanoes.

Increased thermal activity (fumaroles,hot springs)in a volcanic area may signal the presence of hot magma at shallow depths in the crust.

Eruption of magma from a long crack in the lithosphere is a

A volcanic rock of intermediate composition,characteristic of subduction-zone volcanoes like those of the Cascade Range is

Pyroclastics

A dormant volcano that is currently inactive could have a potential to possibly become active.

Which of the following volcanoes is least likely to erupt violently and explosively?

A caldera is

A hot,glowing cloud of gas and ash is sometimes known as a

Volcanic ash from recent eruptions of Aleutian volcanoes has posed a threat to air travel.

Volcanic rocks are

People can be killed by poisonous gases emitted by a volcano even before they realize that they are in danger.

Strategies for stopping an advancing lava flow include all of the following except

Active periods in a volcano's history

Possible precursors of volcanic eruptions include.

The Cascade Range volcanoes

The type of volcano most likely to form over an oceanic "hot spot" is a

Mount St.Helens and the related Cascade Range volcanoes represent the only volcanically active areas in the United States.

Each volcano has a characteristic eruptive style; the nature of past eruptions indicates whether or not a particular volcano is likely to erupt violently in the future.

A significant portion of what is erupted by a volcano is gas.Water vapor represents the largest percentage of the total volume of gas erupted.This gas represents the second largest percentage of the total gas volume

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Exam 5: Volcanoes

Volcanoes that build domes are more likely to erupt explosively than are shield volcanoes.

Increased thermal activity (fumaroles,hot springs)in a volcanic area may signal the presence of hot magma at shallow depths in the crust.

Eruption of magma from a long crack in the lithosphere is a

A volcanic rock of intermediate composition,characteristic of subduction-zone volcanoes like those of the Cascade Range is

Pyroclastics

A dormant volcano that is currently inactive could have a potential to possibly become active.

Which of the following volcanoes is least likely to erupt violently and explosively?

A caldera is

A hot,glowing cloud of gas and ash is sometimes known as a

Volcanic ash from recent eruptions of Aleutian volcanoes has posed a threat to air travel.

Volcanic rocks are

People can be killed by poisonous gases emitted by a volcano even before they realize that they are in danger.

Strategies for stopping an advancing lava flow include all of the following except

Active periods in a volcano's history

Possible precursors of volcanic eruptions include.

The Cascade Range volcanoes

The type of volcano most likely to form over an oceanic "hot spot" is a

Mount St.Helens and the related Cascade Range volcanoes represent the only volcanically active areas in the United States.

Each volcano has a characteristic eruptive style; the nature of past eruptions indicates whether or not a particular volcano is likely to erupt violently in the future.

A significant portion of what is erupted by a volcano is gas.Water vapor represents the largest percentage of the total volume of gas erupted.This gas represents the second largest percentage of the total gas volume

Planet and Population: An Overview

Rocks and Minerals-A First Look

Plate Tectonics

Earthquakes

Streams and Flooding

Coastal Zones and Processes

Mass Movements

Ice and Glaciers,wind and Deserts

Climate-Past, present, and Future

Ground Water and Water Resources

Weathering, erosion, and Soil Resources

Mineral and Rock Resources

Energy Resources-Fossil Fuels

Energy Resources-Alternative Sources

Waste Disposal

Water Pollution

Air Pollution

Environmental Law and Policy

Land-Use Planning and Engineering Geology

Filters