Question 1

What are small basaltic cones built during one short, eruptive episode?

Accepted Answer

A)  stratospheric 
B)  composite cones 
C)  cinder cones 
D)  shield volcanoes 
A)  stratospheric 
B)  composite cones 
C)  cinder cones 
D)  shield volcanoes

Question 2

Which type of mafic lava flow has a fairly smooth, flow folded, ropy surface?

Accepted Answer

A)  pahoehoe 
B)  scoria 
C)  block and ash flow 
D)  aa 
A)  pahoehoe 
B)  scoria 
C)  block and ash flow 
D)  aa

Question 3

Which are usually the most abundant gases emitted during mafic volcanism?

Accepted Answer

A)  chlorine and sodium 
B)  water and carbon dioxide 
C)  neon and ammonia 
D)  oxygen and nitrogen 
A)  chlorine and sodium 
B)  water and carbon dioxide 
C)  neon and ammonia 
D)  oxygen and nitrogen

Question 4

On May 18, 1980, which Cascades volcano blew its top with the largest eruption in North America in recorded history?

Accepted Answer

A)  Mt. Rainier, WA 
B)  Mount St. Helens, WA 
C)  Kilauea, HI 
D)  Mt. Garibaldi, B.C. 
A)  Mt. Rainier, WA 
B)  Mount St. Helens, WA 
C)  Kilauea, HI 
D)  Mt. Garibaldi, B.C.

Question 5

What are the two varieties of basaltic lava flows?

Accepted Answer

A)  bombs, blocks 
B)  tuff, breccia 
C)  aa, pahoehoe 
D)  cinders, pumice 
A)  bombs, blocks 
B)  tuff, breccia 
C)  aa, pahoehoe 
D)  cinders, pumice

Question 6

How quickly are volcanoes like Paricutin in Mexico or Mt. Edziza in central B.C. built?

Accepted Answer

A)  in a single eruption within a few hours 
B)  in several eruptive cycles over 10's of thousands of years 
C)  in a single eruption within a few days 
D)  in a single eruptive cycle lasting about a year or more 
A)  in a single eruption within a few hours 
B)  in several eruptive cycles over 10's of thousands of years 
C)  in a single eruption within a few days 
D)  in a single eruptive cycle lasting about a year or more

Question 7

What is the correct environment for the geologically recent, volcanic activity in the Yellowstone National Park area?

Accepted Answer

A)  related to plate subduction 
B)  intraplate, mantle plume volcanism 
C)  related to a transform plate boundary 
D)  related to divergent plate boundary 
A)  related to plate subduction 
B)  intraplate, mantle plume volcanism 
C)  related to a transform plate boundary 
D)  related to divergent plate boundary

Question 8

Which of the following statements concerning cinder cones is false?

Accepted Answer

A)  They are small volcanoes with fairly steep sides but large central craters. 
B)  They are often asymmetric with the higher rim in the downwind direction. 
C)  The cinders and other pyroclastic particles are consolidated into welded tuff. 
D)  They are built mostly or entirely during one eruptive cycle. 
A)  They are small volcanoes with fairly steep sides but large central craters. 
B)  They are often asymmetric with the higher rim in the downwind direction. 
C)  The cinders and other pyroclastic particles are consolidated into welded tuff. 
D)  They are built mostly or entirely during one eruptive cycle.

Question 9

Which statement about the May, 1980, eruption of Mount St. Helens is false?

Accepted Answer

A)  Plumes of ash rose high into the stratosphere during the major eruptive events. 
B)  Mudflows (lahars) accompanied the major eruptive events going tens of kilometres. 
C)  The event devastated a wide swath of timberland on the north side of the mountain. 
D)  During the eruptive period, the mountain peak was substantially built up by new lava flows and pyroclastic debris. 
A)  Plumes of ash rose high into the stratosphere during the major eruptive events. 
B)  Mudflows (lahars) accompanied the major eruptive events going tens of kilometres. 
C)  The event devastated a wide swath of timberland on the north side of the mountain. 
D)  During the eruptive period, the mountain peak was substantially built up by new lava flows and pyroclastic debris.

Question 10

What kind of material is most commonly added to the landscape in explosive volcanic eruptions?

Accepted Answer

A)  pyroclastics, ash, bombs, and broken rock 
B)  volcanic gases and fumarolic deposits 
C)  thin fluid mafic flows that can travel 10's of kilometers 
D)  volcanic plugs that form inside craters 
A)  pyroclastics, ash, bombs, and broken rock 
B)  volcanic gases and fumarolic deposits 
C)  thin fluid mafic flows that can travel 10's of kilometers 
D)  volcanic plugs that form inside craters

Question 11

Which volcano is a very large, gently sloping mound composed mainly of mafic lava flows?

Accepted Answer

A)  shield 
B)  cinder cone 
C)  stratospheric 
D)  composite cone 
A)  shield 
B)  cinder cone 
C)  stratospheric 
D)  composite cone

Question 12

At the same temperature, why are magmas with high silica contents more viscous?

Accepted Answer

A)  The magmas with high silica content are also richer in iron and too dense to flow. 
B)  Any magma with more than 50% silica content is too sticky to flow. 
C)  Because high viscosity magma will flow more readily and rhyolites flow the farthest. 
D)  They are more linked together in chains and nets that are strong enough to resist flow. 
A)  The magmas with high silica content are also richer in iron and too dense to flow. 
B)  Any magma with more than 50% silica content is too sticky to flow. 
C)  Because high viscosity magma will flow more readily and rhyolites flow the farthest. 
D)  They are more linked together in chains and nets that are strong enough to resist flow.

Question 13

What drives explosive volcanic eruptions?

Accepted Answer

A)  expanding superheated volcanic gases 
B)  collapsing eruption columns 
C)  high pressures from the melting region far beneath the volcano 
D)  andesitic magma's extremely low viscosity 
A)  expanding superheated volcanic gases 
B)  collapsing eruption columns 
C)  high pressures from the melting region far beneath the volcano 
D)  andesitic magma's extremely low viscosity

Question 14

Which type of mafic flow has a rough, jagged, clinkery surface and advances slowly at speeds less than 50 m/hour?

Accepted Answer

A)  block and ash flow 
B)  scoria 
C)  aa 
D)  pahoehoe 
A)  block and ash flow 
B)  scoria 
C)  aa 
D)  pahoehoe

Question 15

What is the dominant lava type erupted along mid- ocean ridges?

Accepted Answer

A)  andesitic 
B)  mafic 
C)  ultramafic 
D)  felsic 
A)  andesitic 
B)  mafic 
C)  ultramafic 
D)  felsic

What are small basaltic cones built during one short, eruptive episode?

Which type of mafic lava flow has a fairly smooth, flow folded, ropy surface?

Which are usually the most abundant gases emitted during mafic volcanism?

On May 18, 1980, which Cascades volcano blew its top with the largest eruption in North America in recorded history?

What are the two varieties of basaltic lava flows?

How quickly are volcanoes like Paricutin in Mexico or Mt. Edziza in central B.C. built?

What is the correct environment for the geologically recent, volcanic activity in the Yellowstone National Park area?

Which of the following statements concerning cinder cones is false?

Which statement about the May, 1980, eruption of Mount St. Helens is false?

What kind of material is most commonly added to the landscape in explosive volcanic eruptions?

Which volcano is a very large, gently sloping mound composed mainly of mafic lava flows?

At the same temperature, why are magmas with high silica contents more viscous?

What drives explosive volcanic eruptions?

Which type of mafic flow has a rough, jagged, clinkery surface and advances slowly at speeds less than 50 m/hour?

What is the dominant lava type erupted along mid- ocean ridges?

An Introduction to Geology and Plate Tectonics

Minerals: the Building Blocks of Rocks

Igneous Rocks

Volcanoes and Volcanic Processes

Weathering and Soil

Sedimentary Rocks

Metamorphism and Metamorphic Rocks

Geologic Time

Crustal Deformation

Earthquakes and Earths Interior

The Ocean Floor

Plate Tectonics: the Framework for Modern Geology

Mountain Building and Continental Frameworks

Mass Wasting: the Work of Gravity

Groundwater

Glaciers and Glaciation

Deserts and Winds

Shorelines

Mineral and Energy Resources

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Exam 15: Running Water

What are small basaltic cones built during one short, eruptive episode?

Which type of mafic lava flow has a fairly smooth, flow folded, ropy surface?

Which are usually the most abundant gases emitted during mafic volcanism?

On May 18, 1980, which Cascades volcano blew its top with the largest eruption in North America in recorded history?

What are the two varieties of basaltic lava flows?

How quickly are volcanoes like Paricutin in Mexico or Mt. Edziza in central B.C. built?

What is the correct environment for the geologically recent, volcanic activity in the Yellowstone National Park area?

Which of the following statements concerning cinder cones is false?

Which statement about the May, 1980, eruption of Mount St. Helens is false?

What kind of material is most commonly added to the landscape in explosive volcanic eruptions?

Which volcano is a very large, gently sloping mound composed mainly of mafic lava flows?

At the same temperature, why are magmas with high silica contents more viscous?

What drives explosive volcanic eruptions?

Which type of mafic flow has a rough, jagged, clinkery surface and advances slowly at speeds less than 50 m/hour?

What is the dominant lava type erupted along mid- ocean ridges?

An Introduction to Geology and Plate Tectonics

Minerals: the Building Blocks of Rocks

Igneous Rocks

Volcanoes and Volcanic Processes

Weathering and Soil

Sedimentary Rocks

Metamorphism and Metamorphic Rocks

Geologic Time

Crustal Deformation

Earthquakes and Earths Interior

The Ocean Floor

Plate Tectonics: the Framework for Modern Geology

Mountain Building and Continental Frameworks

Mass Wasting: the Work of Gravity

Groundwater

Glaciers and Glaciation

Deserts and Winds

Shorelines

Mineral and Energy Resources

Filters