Question 1

All volcanoes ____.

Accepted Answer

A) fall into one of five very distinct categories 
B) display both lava flows and pyroclastic flows 
C) form on either a convergent or a divergent plate boundary 
D) have a conduit leading to a magma chamber beneath the surface 
E) erupt on very short notice, making it difficult for people to prepare 
A) fall into one of five very distinct categories 
B) display both lava flows and pyroclastic flows 
C) form on either a convergent or a divergent plate boundary 
D) have a conduit leading to a magma chamber beneath the surface 
E) erupt on very short notice, making it difficult for people to prepare

Question 2

Most of the world's active volcanoes are ____.

Accepted Answer

A) in South America 
B) randomly distributed 
C) currently erupting 
D) in well-defined zones 
E) the result of hot spot volcanism 
A) in South America 
B) randomly distributed 
C) currently erupting 
D) in well-defined zones 
E) the result of hot spot volcanism

Question 3

Many of the volcanoes in mainland Alaska and the Aleutian Islands ____.

Accepted Answer

A) are in the Cascade Range 
B) were formed over hot spots 
C) were formed over divergent plate boundaries 
D) have formed within the last 1000 years 
E) are composite volcanoes 
A) are in the Cascade Range 
B) were formed over hot spots 
C) were formed over divergent plate boundaries 
D) have formed within the last 1000 years 
E) are composite volcanoes

Question 4

Discuss what volcanologists look for when trying to determine if a volcano is about to erupt.

Accepted Answer

Volcanologists monitor and measure volca

Question 5

Erupting shield volcanoes are rather ____________________ compared with the eruptions of those at convergent plate boundaries.

Accepted Answer

The answer of Erupting shield volcanoes are rather ____________________ compared...

Question 6

A nuée ardente is composed of fiery hot gases and dust.

Accepted Answer

A) True 
 B)False

Question 7

In 1986, in Cameroon, many people died when an explosive cloud of carbon dioxide engulfed them. However, carbon dioxide emitted from volcanic activity is usually no problem because it dissipates quickly in the atmosphere.

Accepted Answer

A) True 
 B)False

Question 8

A volcano that has not erupted within the last 1,000 years is classified as extinct.

Accepted Answer

A) True 
 B)False

Question 9

The volcanic explosivity index (VEI)____.

Accepted Answer

A) describes the characteristic shape of volcanoes 
B) can be used to forecast eruptions 
C) prevents fatalities and property damage 
D) documents the size of eruptions 
E) indicates whether a volcano produced a lava flow or a pyroclastic flow 
A) describes the characteristic shape of volcanoes 
B) can be used to forecast eruptions 
C) prevents fatalities and property damage 
D) documents the size of eruptions 
E) indicates whether a volcano produced a lava flow or a pyroclastic flow

Question 10

Volcanic bombs have a twisted, streamlined shape, which indicates that they ____.

Accepted Answer

A) cooled quickly underwater 
B) were formed from ropy, viscous mafic flows 
C) were erupted as globs of magma that cooled and solidified during their flight through the air 
D) have high amounts of dissolved gases and low amounts of sodium 
E) were erupted gently from a shield volcano and cooled as they moved downslope 
A) cooled quickly underwater 
B) were formed from ropy, viscous mafic flows 
C) were erupted as globs of magma that cooled and solidified during their flight through the air 
D) have high amounts of dissolved gases and low amounts of sodium 
E) were erupted gently from a shield volcano and cooled as they moved downslope

Question 11

A ____ is a type of volcano that has a steep-sided slope near its summit but a decreasing slope toward the base.

Accepted Answer

A) shield volcano 
B) cinder cone 
C) fissure volcano 
D) composite volcano 
E) lava dome 
A) shield volcano 
B) cinder cone 
C) fissure volcano 
D) composite volcano 
E) lava dome

Question 12

In highly viscous, felsic magma, if expansion is inhibited and gas pressure increases. Eventually, the pressure may become great enough to cause a(n)____________________.

Accepted Answer

The answer of In highly viscous, felsic magma, if expansion...

Question 13

Most volcanism at spreading ridges goes undetected because it ____.

Accepted Answer

A) is so rare 
B) occurs on the ocean floor 
C) occurs deep within plutons 
D) occurs deep in subduction zones 
E) cannot be differentiated from other Earth processes 
A) is so rare 
B) occurs on the ocean floor 
C) occurs deep within plutons 
D) occurs deep in subduction zones 
E) cannot be differentiated from other Earth processes

Question 14

The dominant gas emitted from volcanoes is ____.

Accepted Answer

A) water vapor 
B) carbon dioxide 
C) sulfur dioxide 
D) hydrogen fluoride 
E) carbon monoxide 
A) water vapor 
B) carbon dioxide 
C) sulfur dioxide 
D) hydrogen fluoride 
E) carbon monoxide

Question 15

Earth is the most volcanically active body in our solar system.

Accepted Answer

A) True 
 B)False

Question 16

Sometimes tiny pyroclastic particles are ejected into the atmosphere and settle to the surface as a(n)____________________. In contrast, a(n)____________________ is a cloud of these tiny particles and gas that moves along or close to the land surface.

Accepted Answer

The answer of Sometimes tiny pyroclastic particles are ejected into...

Question 17

Calderas are formed when ____.

Accepted Answer

A) low-viscosity magma flows out into very large areas and cools 
B) pyroclastic flows mix with lava flows 
C) the volcanic pipe is plugged and the increase in pressure causes a huge explosion 
D) part of a magma chamber drains and the mountain's summit collapses into the vacated space below 
E) large explosions at the base of a volcano cause the volcano to collapse 
A) low-viscosity magma flows out into very large areas and cools 
B) pyroclastic flows mix with lava flows 
C) the volcanic pipe is plugged and the increase in pressure causes a huge explosion 
D) part of a magma chamber drains and the mountain's summit collapses into the vacated space below 
E) large explosions at the base of a volcano cause the volcano to collapse

Question 18

Where are most volcanoes located?

Accepted Answer

A) the Mediterranean belt 
B) the mid-oceanic ridges 
C) the circum-Pacific belt 
D) the East African Rift Zone 
E) Indonesia 
A) the Mediterranean belt 
B) the mid-oceanic ridges 
C) the circum-Pacific belt 
D) the East African Rift Zone 
E) Indonesia

Exam 5: Volcanoes and Volcanism

All volcanoes ____.

Most of the world's active volcanoes are ____.

Many of the volcanoes in mainland Alaska and the Aleutian Islands ____.

Discuss what volcanologists look for when trying to determine if a volcano is about to erupt.

Erupting shield volcanoes are rather ____________________ compared with the eruptions of those at convergent plate boundaries.

A nuée ardente is composed of fiery hot gases and dust.

In 1986, in Cameroon, many people died when an explosive cloud of carbon dioxide engulfed them. However, carbon dioxide emitted from volcanic activity is usually no problem because it dissipates quickly in the atmosphere.

A volcano that has not erupted within the last 1,000 years is classified as extinct.

The volcanic explosivity index (VEI)____.

Volcanic bombs have a twisted, streamlined shape, which indicates that they ____.

A ____ is a type of volcano that has a steep-sided slope near its summit but a decreasing slope toward the base.

In highly viscous, felsic magma, if expansion is inhibited and gas pressure increases. Eventually, the pressure may become great enough to cause a(n)____________________.

Most volcanism at spreading ridges goes undetected because it ____.

The dominant gas emitted from volcanoes is ____.

Earth is the most volcanically active body in our solar system.

Sometimes tiny pyroclastic particles are ejected into the atmosphere and settle to the surface as a(n)____________________. In contrast, a(n)____________________ is a cloud of these tiny particles and gas that moves along or close to the land surface.

Calderas are formed when ____.

Where are most volcanoes located?

Understanding Earth: a Dynamic and Evolving Planet

Plate Tectonics: a Unifying Theory

Minerals: The Building Blocks of Rocks

Igneous Rocks and Plutons

Weathering, Erosion, and Soil

Sediment and Sedimentary Rocks

Metamorphism and Metamorphic Rocks

Earthquakes and Earthapos;s Interior

Deformation, Mountain Building, and Earthapos;s Crust

Mass Wasting

Running Water--Streams and Rivers

Groundwater

Glaciers and Glaciation

The Work of Wind and Deserts

Oceans, Shorelines, and Shoreline Processes

Geologic Time: Concepts and Principles

Organic Evolution--The Theory and Its Supporting Evidence

Precambrian Earth and Life History

Paleozoic Earth History

Paleozoic Life History

Mesozoic Earth and Life History

Cenozoic Earth and Life History

Filters

Sometimes tiny pyroclastic particles are ejected into the atmosphere and settle to the surface as a(n). In contrast, a(n) is a cloud of these tiny particles and gas that moves along or close to the land surface.