Question 1

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 yearsE) C) and D)
F) All of the above D

Question 2

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.E) A) and B)
F) B) and C)

Question 3

Iceland rises above the Atlantic Ocean as a result of ____________.

Accepted Answer

A)  normal mid-ocean ridge activity
B)  a submarine hot spot located within the interior of a plate
C)  a submarine hot spot located along a mid-ocean ridge
D)  subduction of an oceanic plate underneath the continental Eurasian PlateE) A) and B)
F) A) and D)

Question 4

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 5

The greatest hazard to human life associated with volcanoes is ____________.

Accepted Answer

A)  flowing lava
B)  volcanic gas
C)  falling ash
D)  pyroclastic flowsE) None of the above
F) A) and B)

Question 6

rWhat 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.E) A) and B)
F) B) and D)

Question 7

Large-scale volcanic eruptions can cause a drop in global temperatures.

Accepted Answer

A) True 
 B)False

Question 8

Pillow lavas are associated with ____________.

Accepted Answer

A)  continental rhyolitic eruptions
B)  continental basaltic eruptions
C)  submarine rhyolitic eruptions
D)  submarine basaltic eruptionsE) All of the above
F) B) and D)

Question 9

At continental rifts,vast bodies of basaltic lava flow forth from fissures,forming ____________.

Accepted Answer

A)  flood basalts
B)  pyroclastic flows
C)  ash-fall tuffsD) All of the above
E) B) and C) A

Question 10

Of the three primary forms of subaerial volcanoes,____________ consist of alternating layers of tephra and solidified lava.

Accepted Answer

A)  stratovolcanoes
B)  cinder cones
C)  shield volcanoesD) B) and C)
E) A) and B)

Question 11

Columnar jointing is a type of fracturing that occurs in andesitic and rhyolitic lava flows.

Accepted Answer

A) True 
 B)False

Question 12

Ash,cinders,and blocks are all types of ____________.

Accepted Answer

A)  volcaniclastic debris
B)  lava flows
C)  Pele's hair
D)  volcanoesE) A) and C)
F) All of the above

Question 13

A fast-moving flow consisting of a mixture of water and volcaniclastic debris is termed a ____________.

Accepted Answer

A)  lahar
B)  glowing avalanche
C)  flood basalt
D)  stratovolcanoE) A) and B)
F) A) and C)

Question 14

What was unusual about the 1986 disaster around Lake Nyos in Cameroon?

Accepted Answer

A)  a volcanic eruption involved a lateral blast of volcaniclastic debris that no one anticipated
B)  pyroclastic flows buried surrounding villages,reminiscent of Pompeii 1,900 years earlier
C)  volcanically derived carbon dioxide gas bubbled from the lake and suffocated people and animals nearby
D)  a slurry of lava and lake water flowed rapidly outward from the lake and buried surrounding villagesE) B) and D)
F) None of the above

Question 15

Whether an eruption will primarily produce lava flows or pyroclastic debris is influenced by the ____________.

Accepted Answer

A)  viscosity of the lava
B)  composition of the lava
C)  proportion of volatiles within the lava
D)  All of the above are correct.E) A) and D)
F) All of the above

Question 16

Rhyolitic lavas ____________.

Accepted Answer

A)  do not flow as far from the vent as basaltic lavas do
B)  cool much more slowly than basaltic lavas do
C)  are associated with volcanoes that almost never emit pyroclastic debris
D)  All of the above are correct.E) A) and B)
F) C) and D)

Question 17

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)  YellowstoneE) None of the above
F) All of the above

Question 18

The characteristic "rotten egg" smell of many active volcanoes is derived from ____________.

Accepted Answer

A)  iron and magnesium within lava
B)  carbon dioxide gas
C)  stale water within the magma chamber
D)  hydrogen sulfide gasE) A) and D)
F) B) and C)

Question 19

The Hawaiian island chain is an example of a(n) ____________.

Accepted Answer

A)  island volcanic arc
B)  continental volcanic arc
C)  hot-spot island chain
D)  stratovolcanic assemblyE) C) and D)
F) B) and D) C

Question 20

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 lavaE) None of the above
F) C) and D)

Exam 9: The Wrath of Vulcan: Volcanic Eruptions

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

Correct AnswerverifiedD

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

Correct AnswerverifiedShow Answer

Iceland rises above the Atlantic Ocean as a result of ____________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The greatest hazard to human life associated with volcanoes is ____________.

Correct AnswerverifiedShow Answer

rWhat signs do scientists look for when predicting volcanic eruptions?

Correct AnswerverifiedShow Answer

Large-scale volcanic eruptions can cause a drop in global temperatures.

Correct AnswerverifiedShow Answer

Pillow lavas are associated with ____________.

Correct AnswerverifiedShow Answer

At continental rifts,vast bodies of basaltic lava flow forth from fissures,forming ____________.

Correct AnswerverifiedA

Of the three primary forms of subaerial volcanoes,____________ consist of alternating layers of tephra and solidified lava.

Correct AnswerverifiedShow Answer

Columnar jointing is a type of fracturing that occurs in andesitic and rhyolitic lava flows.

Correct AnswerverifiedShow Answer

Ash,cinders,and blocks are all types of ____________.

Correct AnswerverifiedShow Answer

A fast-moving flow consisting of a mixture of water and volcaniclastic debris is termed a ____________.

Correct AnswerverifiedShow Answer

What was unusual about the 1986 disaster around Lake Nyos in Cameroon?

Correct AnswerverifiedShow Answer

Whether an eruption will primarily produce lava flows or pyroclastic debris is influenced by the ____________.

Correct AnswerverifiedShow Answer

Rhyolitic lavas ____________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The characteristic "rotten egg" smell of many active volcanoes is derived from ____________.

Correct AnswerverifiedShow Answer

The Hawaiian island chain is an example of a(n) ____________.

Correct AnswerverifiedC

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

Correct AnswerverifiedShow Answer

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A

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Columnar jointing is a type of fracturing that occurs in andesitic and rhyolitic lava flows. $Columnar jointing is a type of fracturing that occurs in andesitic and rhyolitic lava flows.$

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C

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