Question 1

According to the text,which of the following is "one of the most hazardous volcanic areas in the world"?

Accepted Answer

A)  Campi Flegrei 
B)  Mount Vesuvius 
C)  Mount St. Helens 
D)  Mount Hood 
E)  Mount Mazama 
A)  Campi Flegrei 
B)  Mount Vesuvius 
C)  Mount St. Helens 
D)  Mount Hood 
E)  Mount Mazama A

Question 2

What evidence do scientists use to decide whether a volcano may be getting ready to erupt?

Accepted Answer

Whether a steam or ash cloud contains shreds of fresh volcanic glass,whether the flank of the volcano is bulging or tilting,whether volcanic gases show an increase in emissions of sulfur compounds or the ratio of sulfur to chlorine,and/or whether the surface temperature of the volcano is increasing.

Question 3

A big bulge sometimes slowly grows on the flank of an active Cascades volcano.Why?

Accepted Answer

A)  Thick lava flows pile up around the vent. 
B)  A huge gas bubble released from the magma inflates it. 
C)  The magma reacts with snow on the volcano, causing magma inflation. 
D)  The hot magma melts older ash, causing it to expand. 
E)  Rising magma is pushing it up. 
A)  Thick lava flows pile up around the vent. 
B)  A huge gas bubble released from the magma inflates it. 
C)  The magma reacts with snow on the volcano, causing magma inflation. 
D)  The hot magma melts older ash, causing it to expand. 
E)  Rising magma is pushing it up. E

Question 4

Which of these is NOT a Cascade volcano of western North America?

Accepted Answer

A)  Mount St. Helens 
B)  Mount Rainier 
C)  Mount Vesuvius 
D)  Mount Hood 
E)  Three Sisters 
A)  Mount St. Helens 
B)  Mount Rainier 
C)  Mount Vesuvius 
D)  Mount Hood 
E)  Three Sisters

Question 5

If an ash flow approaches you from across a kilometer-wide lake,are you likely to be safe or not? Explain why.

Accepted Answer

A)  Safe. Hot ash flows would chill and stop as soon as they hit cold water. 
B)  Safe. Ash flows move along the ground; they would continue harmlessly underwater. 
C)  Safe. Hot ash flows would boil the water, and that would stop them. 
D)  Not safe. A fast-moving ash flow would cause a deadly tsunami wave. 
E)  Not safe. Ash flows can cross much wider bodies of water. 
A)  Safe. Hot ash flows would chill and stop as soon as they hit cold water. 
B)  Safe. Ash flows move along the ground; they would continue harmlessly underwater. 
C)  Safe. Hot ash flows would boil the water, and that would stop them. 
D)  Not safe. A fast-moving ash flow would cause a deadly tsunami wave. 
E)  Not safe. Ash flows can cross much wider bodies of water.

Question 6

What is the smallest amount of volcanic ash on a roof that would commonly cause it to collapse?

Accepted Answer

A)  no amount of ash would cause collapse; it is too light to be a problem 
B)  more than about 3 cm 
C)  more than about 20 cm 
D)  more than 2 meters 
E)  more than 20 meters 
A)  no amount of ash would cause collapse; it is too light to be a problem 
B)  more than about 3 cm 
C)  more than about 20 cm 
D)  more than 2 meters 
E)  more than 20 meters

Question 7

What characteristics of an old ash-fall tuff will permit you to distinguish it from an old ash-flow tuff?

Accepted Answer

An ash-flow tuff is not thinly layered,a

Question 8

How can you approximate the travel distance and which hills a pyroclastic flow might cross?

Accepted Answer

By imagining an ener

Question 9

Why,in some cases,are the gases of an eruption more dangerous than lava flows,debris flows,or ash flows?

Accepted Answer

Sometimes immense am

Question 10

If an ash flow approaches you from the opposite side of a large hill,are you likely to be safe?

Accepted Answer

A)  Safe. You are fine being behind a hill; ash flows go down valleys. 
B)  Safe. The ash flow would stop at the hill or go around the sides of it. 
C)  Safe. You can duck, and it will go over the top of you. 
D)  Not safe. If you are close to the volcano, fast-moving ash flows can go over nearby hills. 
E)  Not safe. Even well away from the volcano, when the ash flow reaches the top of a hill, it picks up speed going down the far side, and that takes it to the top of the next hill, and so on. 
A)  Safe. You are fine being behind a hill; ash flows go down valleys. 
B)  Safe. The ash flow would stop at the hill or go around the sides of it. 
C)  Safe. You can duck, and it will go over the top of you. 
D)  Not safe. If you are close to the volcano, fast-moving ash flows can go over nearby hills. 
E)  Not safe. Even well away from the volcano, when the ash flow reaches the top of a hill, it picks up speed going down the far side, and that takes it to the top of the next hill, and so on.

Question 11

Three Sisters are located just west of which city?

Accepted Answer

A)  Redding, California 
B)  Portland, Oregon 
C)  Bend, Oregon 
D)  Cascade, Oregon 
E)  Weed, California 
A)  Redding, California 
B)  Portland, Oregon 
C)  Bend, Oregon 
D)  Cascade, Oregon 
E)  Weed, California

Question 12

What is paleovolcanology?

Accepted Answer

It is the interpretation of deposits fro

Question 13

Why is Mount Shasta considered a major hazard as it currently stands?

Accepted Answer

It is essentially an enormous

Question 14

Why is paleovolcanology important in predicting future volcanic eruptions?

Accepted Answer

Geoscientists can learn about and study

Question 15

You work at an international airport in the Aleutian Islands of Alaska.Your airport has just canceled all flights for the next 3 days and shut down all flight operations.Explain to angry customers why their flights have been canceled.

Accepted Answer

Ash from erupting volcanoes can cause se

Question 16

Which volcanoes are thought to have been about the same size prior to major eruptions?

Accepted Answer

A)  Three Sisters 
B)  Mount Mazama and Mount Shasta 
C)  Mount Mazama and Mount Lassen 
D)  Mount Mazama and Mount Hood 
E)  Mount Shasta and Mount St. Helens 
A)  Three Sisters 
B)  Mount Mazama and Mount Shasta 
C)  Mount Mazama and Mount Lassen 
D)  Mount Mazama and Mount Hood 
E)  Mount Shasta and Mount St. Helens

Question 17

Volcanic mudflows are caused when which of the following combine?

Accepted Answer

A)  rocks and lava 
B)  water and dirt 
C)  ash and water 
D)  ash and lava 
E)  lava and dirt 
A)  rocks and lava 
B)  water and dirt 
C)  ash and water 
D)  ash and lava 
E)  lava and dirt

Question 18

What two factors,according to the text,encourage people to settle close to active volcanoes?

Accepted Answer

Growing populations

Question 19

What is the best way to avoid a mudflow?

Accepted Answer

A)  Run away from it as fast as you can. 
B)  Climb up the valley wall. 
C)  Crawl up into a ball. 
D)  Jump over it. 
E)  Climb a tree. 
A)  Run away from it as fast as you can. 
B)  Climb up the valley wall. 
C)  Crawl up into a ball. 
D)  Jump over it. 
E)  Climb a tree.

Question 20

Following the May 1980 eruption of Mount St.Helens,Washington,thousands of trees lay on the ground,all parallel to one another.Why?

Accepted Answer

A)  A lateral blast at the beginning of the eruption blew them all down. 
B)  A big earthquake at the beginning of the eruption shook them down. 
C)  Huge mudflows racing downslope flattened them. 
D)  A giant landslide from the volcano toppled them. 
E)  Thermal winds during the eruption toppled them. 
A)  A lateral blast at the beginning of the eruption blew them all down. 
B)  A big earthquake at the beginning of the eruption shook them down. 
C)  Huge mudflows racing downslope flattened them. 
D)  A giant landslide from the volcano toppled them. 
E)  Thermal winds during the eruption toppled them.

According to the text,which of the following is "one of the most hazardous volcanic areas in the world"?

What evidence do scientists use to decide whether a volcano may be getting ready to erupt?

A big bulge sometimes slowly grows on the flank of an active Cascades volcano.Why?

Which of these is NOT a Cascade volcano of western North America?

If an ash flow approaches you from across a kilometer-wide lake,are you likely to be safe or not? Explain why.

What is the smallest amount of volcanic ash on a roof that would commonly cause it to collapse?

What characteristics of an old ash-fall tuff will permit you to distinguish it from an old ash-flow tuff?

How can you approximate the travel distance and which hills a pyroclastic flow might cross?

Why,in some cases,are the gases of an eruption more dangerous than lava flows,debris flows,or ash flows?

If an ash flow approaches you from the opposite side of a large hill,are you likely to be safe?

Three Sisters are located just west of which city?

What is paleovolcanology?

Why is Mount Shasta considered a major hazard as it currently stands?

Why is paleovolcanology important in predicting future volcanic eruptions?

You work at an international airport in the Aleutian Islands of Alaska.Your airport has just canceled all flights for the next 3 days and shut down all flight operations.Explain to angry customers why their flights have been canceled.

Which volcanoes are thought to have been about the same size prior to major eruptions?

Volcanic mudflows are caused when which of the following combine?

What two factors,according to the text,encourage people to settle close to active volcanoes?

What is the best way to avoid a mudflow?

Following the May 1980 eruption of Mount St.Helens,Washington,thousands of trees lay on the ground,all parallel to one another.Why?

Natural Hazards and Disasters

Plate Tectonics and Physical Hazards

Earthquakes and Their Causes

Earthquake Prediction and Mitigation

Tsunami

Volcanoes: Tectonic Environments and Eruptions

Landslides and Other Downslope Movements

Sinkholes, Land Subsidence, and Swelling Soils

Weather, Thunderstorms, And Tornadoes

Climate Change

Streams And Flood Processes

Floods And Human Interactions

Waves,Beaches,And Coastal Erosion

Hurricanes and Nor’easters

Wildfires

Impact of Asteroids and Comets

The Future: Where Do We Go From Here?

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Exam 7: Volcanoes: Hazards and Mitigation

According to the text,which of the following is "one of the most hazardous volcanic areas in the world"?

What evidence do scientists use to decide whether a volcano may be getting ready to erupt?

A big bulge sometimes slowly grows on the flank of an active Cascades volcano.Why?

Which of these is NOT a Cascade volcano of western North America?

If an ash flow approaches you from across a kilometer-wide lake,are you likely to be safe or not? Explain why.

What is the smallest amount of volcanic ash on a roof that would commonly cause it to collapse?

What characteristics of an old ash-fall tuff will permit you to distinguish it from an old ash-flow tuff?

How can you approximate the travel distance and which hills a pyroclastic flow might cross?

Why,in some cases,are the gases of an eruption more dangerous than lava flows,debris flows,or ash flows?

If an ash flow approaches you from the opposite side of a large hill,are you likely to be safe?

Three Sisters are located just west of which city?

What is paleovolcanology?

Why is Mount Shasta considered a major hazard as it currently stands?

Why is paleovolcanology important in predicting future volcanic eruptions?

You work at an international airport in the Aleutian Islands of Alaska.Your airport has just canceled all flights for the next 3 days and shut down all flight operations.Explain to angry customers why their flights have been canceled.

Which volcanoes are thought to have been about the same size prior to major eruptions?

Volcanic mudflows are caused when which of the following combine?

What two factors,according to the text,encourage people to settle close to active volcanoes?

What is the best way to avoid a mudflow?

Following the May 1980 eruption of Mount St.Helens,Washington,thousands of trees lay on the ground,all parallel to one another.Why?

Natural Hazards and Disasters

Plate Tectonics and Physical Hazards

Earthquakes and Their Causes

Earthquake Prediction and Mitigation

Tsunami

Volcanoes: Tectonic Environments and Eruptions

Landslides and Other Downslope Movements

Sinkholes, Land Subsidence, and Swelling Soils

Weather, Thunderstorms, And Tornadoes

Climate Change

Streams And Flood Processes

Floods And Human Interactions

Waves,Beaches,And Coastal Erosion

Hurricanes and Nor’easters

Wildfires

Impact of Asteroids and Comets

The Future: Where Do We Go From Here?

Filters