Question 1

Why do all lava flows not look the same?

Accepted Answer

A)  Eruptive styles of volcanoes vary by geography. 
B)  Chemical composition and gas content of lava vary. 
C)  Lava flows depend on the type of volcano from which they are erupting for their characteristics. 
D)  All of the above are correct. 
A)  Eruptive styles of volcanoes vary by geography. 
B)  Chemical composition and gas content of lava vary. 
C)  Lava flows depend on the type of volcano from which they are erupting for their characteristics. 
D)  All of the above are correct. B

Question 2

Why is our Moon no longer experiencing volcanism?

Accepted Answer

A)  It is not being bombarded by meteorites. 
B)  Its convection cells have shut off. 
C)  It does not have a core. 
D)  It is completely solid. 
A)  It is not being bombarded by meteorites. 
B)  Its convection cells have shut off. 
C)  It does not have a core. 
D)  It is completely solid. A

Question 3

The Eyjafjallajökull eruption of 2010 was particularly disruptive to air traffic because ________________ .

Accepted Answer

A)  it released such a large amount of ash into the air 
B)  it is a large, exposed stratovolcano 
C)  the jet stream was passing over Iceland at the time 
D)  All of the above answers are correct. 
A)  it released such a large amount of ash into the air 
B)  it is a large, exposed stratovolcano 
C)  the jet stream was passing over Iceland at the time 
D)  All of the above answers are correct. C

Question 4

Which national park is home to a large volcanic caldera formed through a very large explosive eruption 640,000 years ago?

Accepted Answer

A)  Acadia 
B)  Carlsbad Caverns 
C)  Great Smoky Mountains 
D)  Yellowstone 
A)  Acadia 
B)  Carlsbad Caverns 
C)  Great Smoky Mountains 
D)  Yellowstone

Question 5

The eruption of Mt.St.Helens in 1980 was the greatest explosive eruption in the last 200 years of world data.

Accepted Answer

A) True 
 B)False

Question 6

Iceland formed where it is today because of the presence of _______________ .

Accepted Answer

A)  the mid-Atlantic ridge 
B)  a hot spot 
C)  the mid-Atlantic ridge and a hot spot 
D)  an island arc 
A)  the mid-Atlantic ridge 
B)  a hot spot 
C)  the mid-Atlantic ridge and a hot spot 
D)  an island arc

Question 7

As compared to subaerial basaltic lavas,submarine basaltic lavas differ in that they ____________.

Accepted Answer

A)  always produce violent pyroclastic debris flows 
B)  produce large crystals of pyroxene and plagioclase 
C)  form pillow-like mounds because they cannot flow as far from their source 
D)  All of the above are correct. 
A)  always produce violent pyroclastic debris flows 
B)  produce large crystals of pyroxene and plagioclase 
C)  form pillow-like mounds because they cannot flow as far from their source 
D)  All of the above are correct.

Question 8

How can a geologist determine whether a shield volcano is extinct?

Accepted Answer

A)  It will have been completely washed away shortly after becoming extinct. 
B)  It will be carved by river or glacial valleys. 
C)  Something akin to Devil's tower will be exposed. 
D)  There will be no volcanic activity anywhere near the area. 
A)  It will have been completely washed away shortly after becoming extinct. 
B)  It will be carved by river or glacial valleys. 
C)  Something akin to Devil's tower will be exposed. 
D)  There will be no volcanic activity anywhere near the area.

Question 9

Of the three primary forms of subaerial volcanoes,____________ have the most gently sloping sides,due to the low viscosity of the basaltic lavas that form them.

Accepted Answer

A)  stratovolcanoes 
B)  cinder cones 
C)  shield volcanoes 
A)  stratovolcanoes 
B)  cinder cones 
C)  shield volcanoes

Question 10

The smoky cloud that rises from the vent of an actively erupting volcano is composed of ____________.

Accepted Answer

A)  smoke from wildfires inside the volcanic chimney 
B)  smoke from wildfires on the outer slopes of the volcano that funnel into the crater 
C)  fine volcaniclastic debris (ash) suspended in the air 
D)  a continuous fountain of dark, basaltic lava 
A)  smoke from wildfires inside the volcanic chimney 
B)  smoke from wildfires on the outer slopes of the volcano that funnel into the crater 
C)  fine volcaniclastic debris (ash) suspended in the air 
D)  a continuous fountain of dark, basaltic lava

Question 11

Most terrestrial volcanic glass ____________.

Accepted Answer

A)  is highly silicic in composition 
B)  is coarse grained 
C)  consists of microscopic crystals 
D)  freezes from lavas with low viscosity 
A)  is highly silicic in composition 
B)  is coarse grained 
C)  consists of microscopic crystals 
D)  freezes from lavas with low viscosity

Question 12

The lithification of material from a pyroclastic flow forms a rock called ____________.

Accepted Answer

A)  metabasalt 
B)  ignimbrite 
C)  migmatite 
D)  tuff 
A)  metabasalt 
B)  ignimbrite 
C)  migmatite 
D)  tuff

Question 13

Basaltic lavas ____________.

Accepted Answer

A)  contain more iron and magnesium than rhyolitic lavas 
B)  contain more silica than rhyolitic lavas 
C)  are more viscous than rhyolitic lavas 
D)  contain a greater proportion of trapped volatiles than rhyolitic lavas 
A)  contain more iron and magnesium than rhyolitic lavas 
B)  contain more silica than rhyolitic lavas 
C)  are more viscous than rhyolitic lavas 
D)  contain a greater proportion of trapped volatiles than rhyolitic lavas

Question 14

Of the three primary forms of subaerial volcanoes,____________ are sometimes referred to as "composite volcanoes."

Accepted Answer

A)  stratovolcanoes 
B)  cinder cones 
C)  shield volcanoes 
A)  stratovolcanoes 
B)  cinder cones 
C)  shield volcanoes

Question 15

Phreatomagmatic eruptions take place when ____________.

Accepted Answer

A)  volatiles effervesce prior to lava flow 
B)  water enters the magma chamber and forms steam 
C)  basaltic lava clogs the chimney 
D)  lava or pyroclastic debris erupt by bursting through the sides of the volcano 
A)  volatiles effervesce prior to lava flow 
B)  water enters the magma chamber and forms steam 
C)  basaltic lava clogs the chimney 
D)  lava or pyroclastic debris erupt by bursting through the sides of the volcano

Question 16

All volcanic eruptions pass through the crater at the volcanic summit.

Accepted Answer

A) True 
 B)False

Question 17

Mafic lavas are distinguished by ____________.

Accepted Answer

A)  light coloration 
B)  low viscosity 
C)  high viscosity 
D)  high silica content 
A)  light coloration 
B)  low viscosity 
C)  high viscosity 
D)  high silica content

Question 18

The hot-spot track associated with the Hawaiian Islands and Emperor Seamounts ____________.

Accepted Answer

A)  shows that the Pacific Plate has been stationary over the last 30 million years 
B)  occurs along a divergent-plate boundary 
C)  occurs along a convergent-plate boundary 
D)  shows that the Pacific Plate has been moving northwest for the last 30 million years 
A)  shows that the Pacific Plate has been stationary over the last 30 million years 
B)  occurs along a divergent-plate boundary 
C)  occurs along a convergent-plate boundary 
D)  shows that the Pacific Plate has been moving northwest for the last 30 million years

Question 19

Hot-spot volcanoes ____________.

Accepted Answer

A)  can arise from the ocean floor 
B)  can arise on continents 
C)  may arise in the interior of lithospheric plates 
D)  All of the above are correct. 
A)  can arise from the ocean floor 
B)  can arise on continents 
C)  may arise in the interior of lithospheric plates 
D)  All of the above are correct.

Question 20

What signs do scientists look for when predicting volcanic eruptions?

Accepted Answer

A)  changes in earthquake activity 
B)  increases in gas and steam emission 
C)  changes in shape 
D)  All of the above are correct. 
A)  changes in earthquake activity 
B)  increases in gas and steam emission 
C)  changes in shape 
D)  All of the above are correct.

Exam 5: The Wrath of Vulcan: Volcanic Eruptions

Why do all lava flows not look the same?

Why is our Moon no longer experiencing volcanism?

The Eyjafjallajökull eruption of 2010 was particularly disruptive to air traffic because ________________ .

Which national park is home to a large volcanic caldera formed through a very large explosive eruption 640,000 years ago?

The eruption of Mt.St.Helens in 1980 was the greatest explosive eruption in the last 200 years of world data.

Iceland formed where it is today because of the presence of _______________ .

As compared to subaerial basaltic lavas,submarine basaltic lavas differ in that they ____________.

How can a geologist determine whether a shield volcano is extinct?

Of the three primary forms of subaerial volcanoes,____________ have the most gently sloping sides,due to the low viscosity of the basaltic lavas that form them.

The smoky cloud that rises from the vent of an actively erupting volcano is composed of ____________.

Most terrestrial volcanic glass ____________.

The lithification of material from a pyroclastic flow forms a rock called ____________.

Basaltic lavas ____________.

Of the three primary forms of subaerial volcanoes,____________ are sometimes referred to as "composite volcanoes."

Phreatomagmatic eruptions take place when ____________.

All volcanic eruptions pass through the crater at the volcanic summit.

Mafic lavas are distinguished by ____________.

The hot-spot track associated with the Hawaiian Islands and Emperor Seamounts ____________.

Hot-spot volcanoes ____________.

What signs do scientists look for when predicting volcanic eruptions?

The Earth in Context

The Way the Earth Works: Plate Tectonics

Patterns in Nature: Minerals

Up From the Inferno: Magma and Igneous Rocks

Pages of Earths Past: Sedimentary Rocks

Metamorphism: a Process of Change

A Violent Pulse: Earthquakes

Crags, cracks, and Crumples: Crustal Deformation and Mountain Building

Deep Time: How Old Is Old

A Biography of Earth

Riches in Rock: Energy and Mineral Resources

Unsafe Ground: Landslides and Other Mass Movements

Streams and Floods: the Geology of Running Water

Restless Realm: Oceans and Coasts

A Hidden Reserve: Groundwater

Dry Regions: the Geology of Deserts

Amazing Ice: Glaciers and Ice Ages

Global Change in the Earth System

Rock Groups

A Surface Veneer: Sediments and Soils

The Rock Cycle

The Earths Interior Revisited: Insights From Geophysics

Memories of Past Life: Fossils and Evolution

An Introduction to Landscapes and the Hydrologic Cycle

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