Question 1

Which of the following is composed of six- sided polygonal columns of rock?

Accepted Answer

A)  Columnar jointing. 
B)  Pahoehoe lava flow. 
C)  Nue´e ardente. 
D)  'A'a lava flow. 
A)  Columnar jointing. 
B)  Pahoehoe lava flow. 
C)  Nue´e ardente. 
D)  'A'a lava flow.

Question 2

Pyroclastic eruptions are likely to occur in all of the following locations EXCEPT:

Accepted Answer

A)  along transform boundaries. 
B)  above subducting plate boundaries. 
C)  above continental intraplate hot spots. 
D)  within intracontinental rift zones. 
A)  along transform boundaries. 
B)  above subducting plate boundaries. 
C)  above continental intraplate hot spots. 
D)  within intracontinental rift zones.

Question 3

How do volcanic craters form?

Accepted Answer

Craters form after a volcanic

Question 4

Which magma type produces the most lava flows?

Accepted Answer

A)  Basaltic. 
B)  Rhyolitic. 
C)  Andesitic. 
D)  None of the above. 
A)  Basaltic. 
B)  Rhyolitic. 
C)  Andesitic. 
D)  None of the above.

Question 5

The greatest danger to Hawai'i from the undersea volcano Loihi is:

Accepted Answer

A)  earthquake swarms. 
B)  explosive steam eruptions. 
C)  tsunamis. 
D)  ash- flow eruptions. 
A)  earthquake swarms. 
B)  explosive steam eruptions. 
C)  tsunamis. 
D)  ash- flow eruptions.

Question 6

A volcanic dome forms when:

Accepted Answer

A)  faulting causes uplift of a volcano. 
B)  a large volcanic mountain is rounded off by erosion. 
C)  rising magma cools and hardens within a volcano's crater. 
D)  a shield volcano takes on a relatively symmetrical dome shape. 
A)  faulting causes uplift of a volcano. 
B)  a large volcanic mountain is rounded off by erosion. 
C)  rising magma cools and hardens within a volcano's crater. 
D)  a shield volcano takes on a relatively symmetrical dome shape.

Question 7

Describe the differences between the plate- tectonic settings of rhyolitic and basaltic volcanoes.

Accepted Answer

Rhyolitic volcanoes tend to occur along

Question 8

Volcanic smog forms by reaction of:

Accepted Answer

A)  sulfur dioxide with oxygen. 
B)  sulfur dioxide with sulfur crystals. 
C)  sulfur dioxide with Carbon dioxide. 
D)  sulfur dioxide with water. 
A)  sulfur dioxide with oxygen. 
B)  sulfur dioxide with sulfur crystals. 
C)  sulfur dioxide with Carbon dioxide. 
D)  sulfur dioxide with water.

Question 9

Direct evidence of volcanism has been discovered on all of the following EXCEPT:

Accepted Answer

A)  the Moon. 
B)  Mars. 
C)  Venus. 
D)  Saturn. 
A)  the Moon. 
B)  Mars. 
C)  Venus. 
D)  Saturn.

Question 10

The principal factor(s) influencing upward magma migration before cooling is (are):

Accepted Answer

A)  the climate and temperature regime that affects the land surrounding the volcano. 
B)  the time since the last eruption, combined with the density of the rocks overlying the volcano. 
C)  the magmatic gas content, combined with magma viscosity. 
D)  the magmatic water content. 
A)  the climate and temperature regime that affects the land surrounding the volcano. 
B)  the time since the last eruption, combined with the density of the rocks overlying the volcano. 
C)  the magmatic gas content, combined with magma viscosity. 
D)  the magmatic water content.

Question 11

All of the following are somewhat effective means of dealing with volcanic hazards EXCEPT:

Accepted Answer

A)  cooling a lava front with water. 
B)  bombing of lava flows. 
C)  plugging a volcano's vent. 
D)  accurately predicting a volcanic eruption. 
A)  cooling a lava front with water. 
B)  bombing of lava flows. 
C)  plugging a volcano's vent. 
D)  accurately predicting a volcanic eruption.

Question 12

Shield volcanoes are most likely to form from:

Accepted Answer

A)  pyroclastic ash- flow eruptions. 
B)  culminating pyroclastic eruptions. 
C)  effusive eruptions from a central vent. 
D)  effusive eruptions from a fissure. 
A)  pyroclastic ash- flow eruptions. 
B)  culminating pyroclastic eruptions. 
C)  effusive eruptions from a central vent. 
D)  effusive eruptions from a fissure.

Question 13

An active volcano is any volcano that:

Accepted Answer

A)  is currently erupting or has erupted recently (in geological terms). 
B)  has not been worn away by erosion. 
C)  has not erupted recently (in geological terms) but is likely to erupt in the future. 
D)  is located on an active tectonic plate boundary. 
A)  is currently erupting or has erupted recently (in geological terms). 
B)  has not been worn away by erosion. 
C)  has not erupted recently (in geological terms) but is likely to erupt in the future. 
D)  is located on an active tectonic plate boundary.

Question 14

A lahar can best be described as a:

Accepted Answer

A)  flow of hot lava. 
B)  volcanic mudflow. 
C)  flow of gas and hot ash. 
D)  rain of tephra particles. 
A)  flow of hot lava. 
B)  volcanic mudflow. 
C)  flow of gas and hot ash. 
D)  rain of tephra particles.

Question 15

The most quiet and least dangerous volcanic eruptions involve:

Accepted Answer

A)  glowing avalanches of volcanic rock fragments. 
B)  fountains and flowing streams of lava. 
C)  showers of fine ash particles. 
D)  fallout of volcanic blocks the size of automobiles. 
A)  glowing avalanches of volcanic rock fragments. 
B)  fountains and flowing streams of lava. 
C)  showers of fine ash particles. 
D)  fallout of volcanic blocks the size of automobiles.

Question 16

Deep water eruptions (below about 300 meters) display a characteristic structure called:

Accepted Answer

A)  pillows. 
B)  'a'a. 
C)  columnar jointing. 
D)  pahoehoe. 
A)  pillows. 
B)  'a'a. 
C)  columnar jointing. 
D)  pahoehoe.

Question 17

A pyroclastic volcanic eruption in which there is no volcanic cone but tephra is expelled from a series of ring- like fractures is called a(n):

Accepted Answer

A)  effusive eruption. 
B)  culminating eruption. 
C)  fissure eruption. 
D)  ash- flow eruption. 
A)  effusive eruption. 
B)  culminating eruption. 
C)  fissure eruption. 
D)  ash- flow eruption.

Question 18

Felsic magmas with high water and gas content commonly form:

Accepted Answer

A)  'a'a. 
B)  columnar jointing. 
C)  pumice. 
D)  pahoehoe. 
A)  'a'a. 
B)  columnar jointing. 
C)  pumice. 
D)  pahoehoe.

Question 19

An effusive eruption from a fissure would most likely result in:

Accepted Answer

A)  a composite cone. 
B)  a shield cone. 
C)  a cinder cone. 
D)  a flood basalt. 
A)  a composite cone. 
B)  a shield cone. 
C)  a cinder cone. 
D)  a flood basalt.

Question 20

A volcano can spew several kinds of gases into the air, but most of the gas is:

Accepted Answer

A)  nitrogen and carbon dioxide. 
B)  nitrogen and sulfur dioxide. 
C)  water vapor and carbon dioxide. 
D)  sulfur dioxide and chlorine. 
A)  nitrogen and carbon dioxide. 
B)  nitrogen and sulfur dioxide. 
C)  water vapor and carbon dioxide. 
D)  sulfur dioxide and chlorine.

Which of the following is composed of six- sided polygonal columns of rock?

Pyroclastic eruptions are likely to occur in all of the following locations EXCEPT:

How do volcanic craters form?

Which magma type produces the most lava flows?

The greatest danger to Hawai'i from the undersea volcano Loihi is:

A volcanic dome forms when:

Describe the differences between the plate- tectonic settings of rhyolitic and basaltic volcanoes.

Volcanic smog forms by reaction of:

Direct evidence of volcanism has been discovered on all of the following EXCEPT:

The principal factor(s) influencing upward magma migration before cooling is (are):

All of the following are somewhat effective means of dealing with volcanic hazards EXCEPT:

Shield volcanoes are most likely to form from:

An active volcano is any volcano that:

A lahar can best be described as a:

The most quiet and least dangerous volcanic eruptions involve:

Deep water eruptions (below about 300 meters) display a characteristic structure called:

A pyroclastic volcanic eruption in which there is no volcanic cone but tephra is expelled from a series of ring- like fractures is called a(n):

Felsic magmas with high water and gas content commonly form:

An effusive eruption from a fissure would most likely result in:

A volcano can spew several kinds of gases into the air, but most of the gas is:

A First Look at Planet Earth - Its Origins, Systems, and Tectonic Plates

Minerals

Igneous Rocks and Processes

Weathering - the Breakdown of Rocks

Sedimentary Processes, Environments, and Rocks

Metamorphism and Metamorphic Rocks

Telling Time Geologically

Earth Structures - Folds, Faults, and Fabrics

Earthquakes

The Earths Interior - Whats Going on Down There

Plate Tectonics and the Formation of the Earths Oceans

Continental Tectonics and the Formation of the Earths Continents

Mass Movement

Streams and Floods

Groundwater

Glaciers and Ice Ages

Deserts and the Work of Winds

Shores and Coastal Processes

Human Use of the Earths Resources Appendices Glossary

Filters

Exam 4: Volcanoes and Volcanism

Which of the following is composed of six- sided polygonal columns of rock?

Pyroclastic eruptions are likely to occur in all of the following locations EXCEPT:

How do volcanic craters form?

Which magma type produces the most lava flows?

The greatest danger to Hawai'i from the undersea volcano Loihi is:

A volcanic dome forms when:

Describe the differences between the plate- tectonic settings of rhyolitic and basaltic volcanoes.

Volcanic smog forms by reaction of:

Direct evidence of volcanism has been discovered on all of the following EXCEPT:

The principal factor(s) influencing upward magma migration before cooling is (are):

All of the following are somewhat effective means of dealing with volcanic hazards EXCEPT:

Shield volcanoes are most likely to form from:

An active volcano is any volcano that:

A lahar can best be described as a:

The most quiet and least dangerous volcanic eruptions involve:

Deep water eruptions (below about 300 meters) display a characteristic structure called:

A pyroclastic volcanic eruption in which there is no volcanic cone but tephra is expelled from a series of ring- like fractures is called a(n):

Felsic magmas with high water and gas content commonly form:

An effusive eruption from a fissure would most likely result in:

A volcano can spew several kinds of gases into the air, but most of the gas is:

A First Look at Planet Earth - Its Origins, Systems, and Tectonic Plates

Minerals

Igneous Rocks and Processes

Weathering - the Breakdown of Rocks

Sedimentary Processes, Environments, and Rocks

Metamorphism and Metamorphic Rocks

Telling Time Geologically

Earth Structures - Folds, Faults, and Fabrics

Earthquakes

The Earths Interior - Whats Going on Down There

Plate Tectonics and the Formation of the Earths Oceans

Continental Tectonics and the Formation of the Earths Continents

Mass Movement

Streams and Floods

Groundwater

Glaciers and Ice Ages

Deserts and the Work of Winds

Shores and Coastal Processes

Human Use of the Earths Resources Appendices Glossary

Filters