Question 1

Huge circular depressions from which volcanoes erupt are called:

Accepted Answer

A)   calderas
B)   fissures
C)   cones

Question 2

Mount Pelée, a composite volcano on Martinique, destroyed the town of St. Pierre in 1902, killing about 30,000 people with:

Accepted Answer

A)   pyroclastic flows
B)   basaltic lava flows
C)   lahars and mudflows

Question 3

Volcanic domes commonly are partially destroyed when:

Accepted Answer

A)   gases are released slowly out the top of the dome, dissolving it
B)   steep parts of the dome collapse and cause small pyroclastic flows
C)   fast-moving, low-viscosity lava carries away part of the dome
D)   the center of the dome collapses, forming a composite volcano
E)   all of these

Question 4

Which represents the largest igneous eruptions on Earth?

Accepted Answer

A)   Flood basalts
B)   Rhyolite ash columns
C)   Curtains of fire A

Question 5

Which of the following is NOT a common type of volcano?

Accepted Answer

A)   mesa
B)   shield
C)   dome
D)   composite cone

Question 6

Eruptions of scoria cones are commonly associated with:

Accepted Answer

A)   basaltic lava flows
B)   lava fountains
C)   pyroclastic flow
D)   viscous lava flows
E)   basaltic lava flows and lava fountains

Question 7

Scoria cones are composed primarily of:

Accepted Answer

A)   ejected fragments of vesicular lava
B)   blocky lava flows and lahar deposits
C)   pahoehoe and/or a'a
D)   volcanic ash

Question 8

What types of rocks would be common in a composite volcano?

Accepted Answer

A)   felsic and intermediate lava flows
B)   pyroclastic rocks from an eruption column
C)   pyroclastic rocks from pyroclastic flows
D)   rocks with fragments formed by landslides and mudflows
E)   all of these

Question 9

Which of the following is NOT a way in which a volcano's history indicates the level of hazard it poses to nearby population centers?

Accepted Answer

A)   Length of time since last eruption
B)   Average time between eruptions
C)   Abundance of felsic pyroclastic materials in its deposits
D)   Age of the oldest volcanic layer present

Question 10

What type of eruption formed the volcano in this photograph?

Accepted Answer

A)   fluid lava flows
B)   eruption of viscous lava
C)   lava fountain
D)   eruption column
E)   pyroclastic flow

Question 11

Which of the following sites has volcanism related to a hot spot or divergent margin? A is on an island arc, B is in the Andes, C is near Hawaii, D is along a mid-ocean ridge.

Accepted Answer

A)   A and B
B)   B and C
C)   C and D
D)   A and C
E)   B and D C

Question 12

What type of volcanic eruption is probably shown in this photograph?

Accepted Answer

A)   pyroclastic flow
B)   fire fountain
C)   basaltic lava flow
D)   felsic lava flow
E)   caldera eruption

Question 13

Some scientists think that Yellowstone could cause a future disaster because:

Accepted Answer

A)   the area is part of a caldera
B)   scientists think that magma is still present at depth
C)   past eruptions from Yellowstone carried ash over a huge area of western North America
D)   land near Yellowstone is uplifting in some places and subsiding in others
E)   all of these

Question 14

At what depth do gas bubbles have the most effect on magma?

Accepted Answer

A)   when the magma first forms, before the bubbles can dissolve into the magma
B)   at moderate depths, when the magma is moving rapidly through the conduit
C)   at very shallow levels, such as within the volcano
D)   none of these

Question 15

If bubbles cannot escape easily from a magma, the resulting eruption is likely to:

Accepted Answer

A)   be explosive
B)   be nonexplosive
C)   produce long, thin lava flows

Question 16

What tectonic setting is interpreted to be the cause of volcanism at Yellowstone?

Accepted Answer

A)   subduction along the coast of the Pacific Northwest
B)   magma that is coming up along a bend in a transform fault
C)   movement of North America over a mantle plume
D)   a large meteorite impact that struck the area 100 years ago

Question 17

Which of the numbered features is a pyroclastic column?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5

Question 18

Which of the following is NOT a major controlling factor on volcanic eruption style?

Accepted Answer

A)   Age of volcano
B)   Chemistry of the magma
C)   Magma volatile content A

Question 19

This igneous rock contains flattened pieces of pumice and small crystals of quartz and feldspar. What type of rock is it?

Accepted Answer

A)   basalt
B)   rhyolite or obsidian
C)   welded tuff
D)   volcanic breccia

Question 20

What is the plate-tectonic setting of Mount Rainier?

Accepted Answer

A)   a hot spot related to Yellowstone
B)   spreading along the Juan de Fuca ridge
C)   a continent-continent collision
D)   subduction beneath the Pacific Northwest
E)   none of these

Exam 6: Volcanoes and Volcanic Hazards

Huge circular depressions from which volcanoes erupt are called:

Correct AnswerverifiedShow Answer

Mount Pelée, a composite volcano on Martinique, destroyed the town of St. Pierre in 1902, killing about 30,000 people with:

Correct AnswerverifiedShow Answer

Volcanic domes commonly are partially destroyed when:

Correct AnswerverifiedShow Answer

Which represents the largest igneous eruptions on Earth?

Correct AnswerverifiedA

Which of the following is NOT a common type of volcano?

Correct AnswerverifiedShow Answer

Eruptions of scoria cones are commonly associated with:

Correct AnswerverifiedShow Answer

Scoria cones are composed primarily of:

Correct AnswerverifiedShow Answer

What types of rocks would be common in a composite volcano?

Correct AnswerverifiedShow Answer

Which of the following is NOT a way in which a volcano's history indicates the level of hazard it poses to nearby population centers?

Correct AnswerverifiedShow Answer

What type of eruption formed the volcano in this photograph?

Correct AnswerverifiedShow Answer

Which of the following sites has volcanism related to a hot spot or divergent margin? A is on an island arc, B is in the Andes, C is near Hawaii, D is along a mid-ocean ridge.

Correct AnswerverifiedC

What type of volcanic eruption is probably shown in this photograph?

Correct AnswerverifiedShow Answer

Some scientists think that Yellowstone could cause a future disaster because:

Correct AnswerverifiedShow Answer

At what depth do gas bubbles have the most effect on magma?

Correct AnswerverifiedShow Answer

If bubbles cannot escape easily from a magma, the resulting eruption is likely to:

Correct AnswerverifiedShow Answer

What tectonic setting is interpreted to be the cause of volcanism at Yellowstone?

Correct AnswerverifiedShow Answer

Which of the numbered features is a pyroclastic column?

Correct AnswerverifiedShow Answer

Which of the following is NOT a major controlling factor on volcanic eruption style?

Correct AnswerverifiedA

This igneous rock contains flattened pieces of pumice and small crystals of quartz and feldspar. What type of rock is it?

Correct AnswerverifiedShow Answer

What is the plate-tectonic setting of Mount Rainier?

Correct AnswerverifiedShow Answer

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C

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