Question 1

A nue´e ardente can best be described as a:

Accepted Answer

A)  flow of trapped air. 
B)  flow of hot pyroclastic material. 
C)  rain of tephra particles. 
D)  flow of hot lava. 
A)  flow of trapped air. 
B)  flow of hot pyroclastic material. 
C)  rain of tephra particles. 
D)  flow of hot lava.

Question 2

The term viscosity refers to:

Accepted Answer

A)  how a liquid moves upward against gravity. 
B)  how heat and pressure influence a liquid's gas content. 
C)  how dense a liquid is. 
D)  a liquid's resistance to flow. 
A)  how a liquid moves upward against gravity. 
B)  how heat and pressure influence a liquid's gas content. 
C)  how dense a liquid is. 
D)  a liquid's resistance to flow.

Question 3

All of the following statements concerning magma movement are true EXCEPT:

Accepted Answer

A)  a highly viscous magma usually crystallizes at lower temperatures. 
B)  the gases in low- viscosity magmas tend to escape easily when the magma reaches the surface. 
C)  as heat reduces viscosity, ions within a magma move more rapidly. 
D)  a very viscous magma tends to be less explosive. 
A)  a highly viscous magma usually crystallizes at lower temperatures. 
B)  the gases in low- viscosity magmas tend to escape easily when the magma reaches the surface. 
C)  as heat reduces viscosity, ions within a magma move more rapidly. 
D)  a very viscous magma tends to be less explosive.

Question 4

Which of the events associated with the Toba eruption most affected human populations?

Accepted Answer

A)  Elimination of food sources. 
B)  Worldwide fall in sea level. 
C)  One- thousand- year- long glacial expansion. 
D)  Widespread cold weather. 
A)  Elimination of food sources. 
B)  Worldwide fall in sea level. 
C)  One- thousand- year- long glacial expansion. 
D)  Widespread cold weather.

Question 5

Why is basalt more common than gabbro, but rhyolite less common than granite?

Accepted Answer

A)  The silica content of rhyolitic lavas is less than basaltic lavas. 
B)  Rhyolitic lavas are hotter than basaltic magmas. 
C)  Basaltic lavas are less viscous than rhyolitic lavas. 
D)  Basaltic lavas are more viscous than rhyolitic lavas. 
A)  The silica content of rhyolitic lavas is less than basaltic lavas. 
B)  Rhyolitic lavas are hotter than basaltic magmas. 
C)  Basaltic lavas are less viscous than rhyolitic lavas. 
D)  Basaltic lavas are more viscous than rhyolitic lavas.

Question 6

All of the following are true regarding tephra EXCEPT:

Accepted Answer

A)  volcanic ash is coarser than volcanic dust. 
B)  tephra may consist of sizable blocks of solidified lava known as volcanic bombs. 
C)  tephra is usually formed under water. 
D)  coarser- grained tephra deposits are usually nearer the volcanic source. 
A)  volcanic ash is coarser than volcanic dust. 
B)  tephra may consist of sizable blocks of solidified lava known as volcanic bombs. 
C)  tephra is usually formed under water. 
D)  coarser- grained tephra deposits are usually nearer the volcanic source.

Question 7

The force that causes pyroclastic volcanoes to explode violently is:

Accepted Answer

A)  density differences within the magma that force part of the magma upward. 
B)  pressure from volcanic gases. 
C)  chemically volatile substances that explode within the magma. 
D)  hot convection currents in the asthenosphere that push magma upward. 
A)  density differences within the magma that force part of the magma upward. 
B)  pressure from volcanic gases. 
C)  chemically volatile substances that explode within the magma. 
D)  hot convection currents in the asthenosphere that push magma upward.

Question 8

Which of the following is LEAST likely to be a product of a volcano with an andesitic lava?

Accepted Answer

A)  Pillow structures. 
B)  'A'a. 
C)  Pahoehoe. 
D)  Columnar jointing. 
A)  Pillow structures. 
B)  'A'a. 
C)  Pahoehoe. 
D)  Columnar jointing.

Question 9

What volcanic phenomenon occurred during recent eruptions of Montserrat's Soufriere Hills volcano?

Accepted Answer

A)  Explosive eruptions of volcanic ash. 
B)  Toxic gases covered the island. 
C)  Island was blanketed in volcanic mudflows. 
D)  Numerous lava flows scorched the island. 
A)  Explosive eruptions of volcanic ash. 
B)  Toxic gases covered the island. 
C)  Island was blanketed in volcanic mudflows. 
D)  Numerous lava flows scorched the island.

Question 10

Discuss three methods for coping with volcanic hazards.

Accepted Answer

Although we cannot prevent violent erupt

Question 11

What rock type blocked ships after the eruption of Krakatau in 1883?

Accepted Answer

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

Question 12

The greatest danger from a subglacial eruption is:

Accepted Answer

A)  explosive steam eruptions. 
B)  outburst floods. 
C)  suffocating ash clouds. 
D)  extensive lava fountains and flows. 
A)  explosive steam eruptions. 
B)  outburst floods. 
C)  suffocating ash clouds. 
D)  extensive lava fountains and flows.

A nue´e ardente can best be described as a:

The term viscosity refers to:

All of the following statements concerning magma movement are true EXCEPT:

Which of the events associated with the Toba eruption most affected human populations?

Why is basalt more common than gabbro, but rhyolite less common than granite?

All of the following are true regarding tephra EXCEPT:

The force that causes pyroclastic volcanoes to explode violently is:

Which of the following is LEAST likely to be a product of a volcano with an andesitic lava?

What volcanic phenomenon occurred during recent eruptions of Montserrat's Soufriere Hills volcano?

Discuss three methods for coping with volcanic hazards.

What rock type blocked ships after the eruption of Krakatau in 1883?

The greatest danger from a subglacial eruption 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

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Exam 4: Volcanoes and Volcanism

A nue´e ardente can best be described as a:

The term viscosity refers to:

All of the following statements concerning magma movement are true EXCEPT:

Which of the events associated with the Toba eruption most affected human populations?

Why is basalt more common than gabbro, but rhyolite less common than granite?

All of the following are true regarding tephra EXCEPT:

The force that causes pyroclastic volcanoes to explode violently is:

Which of the following is LEAST likely to be a product of a volcano with an andesitic lava?

What volcanic phenomenon occurred during recent eruptions of Montserrat's Soufriere Hills volcano?

Discuss three methods for coping with volcanic hazards.

What rock type blocked ships after the eruption of Krakatau in 1883?

The greatest danger from a subglacial eruption 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