Question 1

A mixture of air,hot ash,and pumice lapilli that rushes down the side of a volcano in a scalding avalanche is termed a(n) ________.

Accepted Answer

A)  ash fall
B)  lahar
C)  pyroclastic flow
D)  convective plume

Question 2

The tall polygonal features preserved in the ancient basalt flow in the image below formed because the lava ________.

Accepted Answer

A)  was moving as it cooled,so it fractured
B)  erupted underwater and cooled rapidly,forming many fractures
C)  was subjected to shaking from earthquakes,and subsequently fractured
D)  shrank as it cooled,forming tall polygonal-shaped fractures

Question 3

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 volcanoes
D)  fissure volcanoes

Question 4

Of the three primary forms of subaerial volcanoes,________ are typically the largest in area.

Accepted Answer

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

Question 5

Whether an eruption will primarily produce lava flows or pyroclastic debris is NOT influenced by the ________ the source magma.

Accepted Answer

A)  viscosity of
B)  composition of
C)  proportion of volatiles within
D)  depth and residence time of

Question 6

Mt.Fuji in Japan is an example of a ________.

Accepted Answer

A)  stratovolcano
B)  cinder cone
C)  shield volcano
D)  fissure volcano

Question 7

Explosive or voluminous eruptions may cause the volcano to collapse on the floor of the now-empty magma chamber,producing a broad depression termed a ________.

Accepted Answer

A)  crater
B)  lahar
C)  caldera
D)  fissure

Question 8

Columnar joints form when ________.

Accepted Answer

A)  a lava flow cools very rapidly,causing the flow to shatter in a chaotic pattern
B)  a lava flow encounters groundwater,which causes the flow to rapidly fracture
C)  a lava flow erupts under deep water
D)  during the final stages of cooling,a lava flow contracts,forming tall polygonal fractures

Question 9

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)  typically contain a greater proportion of trapped volatiles than rhyolitic lavas

Question 10

Which of the following is NOT true? Phreatic eruptions ________.

Accepted Answer

A)  can be so explosive that a significant portion of the volcano can be destroyed
B)  occur when groundwater or seawater enters the magma chamber
C)  occur due to fractional crystallization of the magma chamber
D)  produce little to no lava at the surface

Question 11

A volcanic eruption that is emitted from the sides of a volcano is termed a(n) ________ eruption.

Accepted Answer

A)  phreatic
B)  vulcanian
C)  effusive
D)  flank

Question 12

Olympus Mons,the largest known volcano in our Solar System,is found on ________.

Accepted Answer

A)  Earth
B)  Mars
C)  Venus
D)  Io,a moon of Jupiter

Question 13

Basaltic lavas that solidify at the surface before flow ceases fracture irregularly,producing a sharp-surfaced,blocky,and irregular lava rock named ________.

Accepted Answer

A)  pahoehoe
B)  a'a'
C)  pumice
D)  ignimbrite

Question 14

The largest known volcanic eruption in the last million years occurred at ________.

Accepted Answer

A)  Toba Volcano (Indonesia) 
B)  Mt.St.Helens (US
A)  
C)  Mt.Pinatubo (Philippines) 
D)  Yellowstone Caldera (US
A)   A

Question 15

In 79 C.E.,the citizens of Pompeii in the Roman Empire were buried by pyroclastic debris derived from an eruption of ________.

Accepted Answer

A)  Mt.Olympus
B)  Olympus Mons
C)  Mt.Vesuvius
D)  Mt.St.Helens

Question 16

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

Accepted Answer

A)  pyroclastic debris
B)  lava flows
C)  Pele's hair
D)  volcanoes

Question 17

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 Plate C

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 gas

Question 19

The textural term for a basaltic lava flow that has a smooth,ropy appearance is ________.

Accepted Answer

A)  pahoehoe
B)  a'a'
C)  pumice
D)  ignimbrite A

Question 20

In 1902,a famous,deadly pyroclastic flow killed thousands of people on the Caribbean island of ________.

Accepted Answer

A)  Puerto Rico
B)  Martinique
C)  Aruba
D)  Jamaica

Exam 9: The Wrath of Vulcan: Volcanic Eruptions

A mixture of air,hot ash,and pumice lapilli that rushes down the side of a volcano in a scalding avalanche is termed a(n) ________.

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

Of the three primary forms of subaerial volcanoes,________ are typically the largest in area.

Correct Answer
verified

Whether an eruption will primarily produce lava flows or pyroclastic debris is NOT influenced by the ________ the source magma.

Correct Answer
verified

Mt.Fuji in Japan is an example of a ________.

Correct Answer
verified

Explosive or voluminous eruptions may cause the volcano to collapse on the floor of the now-empty magma chamber,producing a broad depression termed a ________.

Correct Answer
verified

Columnar joints form when ________.

Correct Answer
verified

Basaltic lavas ________.

Correct Answer
verified

Which of the following is NOT true? Phreatic eruptions ________.

Correct Answer
verified

A volcanic eruption that is emitted from the sides of a volcano is termed a(n) ________ eruption.

Correct Answer
verified

Olympus Mons,the largest known volcano in our Solar System,is found on ________.

Correct Answer
verified

Basaltic lavas that solidify at the surface before flow ceases fracture irregularly,producing a sharp-surfaced,blocky,and irregular lava rock named ________.

Correct Answer
verified

The largest known volcanic eruption in the last million years occurred at ________.

Correct Answer
verified
A

In 79 C.E.,the citizens of Pompeii in the Roman Empire were buried by pyroclastic debris derived from an eruption of ________.

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified
C

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

Correct Answer
verified

The textural term for a basaltic lava flow that has a smooth,ropy appearance is ________.

Correct Answer
verified
A

In 1902,a famous,deadly pyroclastic flow killed thousands of people on the Caribbean island of ________.

Correct Answer
verified

Exam 9: The Wrath of Vulcan: Volcanic Eruptions

A mixture of air,hot ash,and pumice lapilli that rushes down the side of a volcano in a scalding avalanche is termed a(n) ________.

Correct AnswerverifiedShow Answer

The tall polygonal features preserved in the ancient basalt flow in the image below formed because the lava ________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Of the three primary forms of subaerial volcanoes,________ are typically the largest in area.

Correct AnswerverifiedShow Answer

Whether an eruption will primarily produce lava flows or pyroclastic debris is NOT influenced by the ________ the source magma.

Correct AnswerverifiedShow Answer

Mt.Fuji in Japan is an example of a ________.

Correct AnswerverifiedShow Answer

Explosive or voluminous eruptions may cause the volcano to collapse on the floor of the now-empty magma chamber,producing a broad depression termed a ________.

Correct AnswerverifiedShow Answer

Columnar joints form when ________.

Correct AnswerverifiedShow Answer

Basaltic lavas ________.

Correct AnswerverifiedShow Answer

Which of the following is NOT true? Phreatic eruptions ________.

Correct AnswerverifiedShow Answer

A volcanic eruption that is emitted from the sides of a volcano is termed a(n) ________ eruption.

Correct AnswerverifiedShow Answer

Olympus Mons,the largest known volcano in our Solar System,is found on ________.

Correct AnswerverifiedShow Answer

Basaltic lavas that solidify at the surface before flow ceases fracture irregularly,producing a sharp-surfaced,blocky,and irregular lava rock named ________.

Correct AnswerverifiedShow Answer

The largest known volcanic eruption in the last million years occurred at ________.

Correct AnswerverifiedA

In 79 C.E.,the citizens of Pompeii in the Roman Empire were buried by pyroclastic debris derived from an eruption of ________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedC

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

Correct AnswerverifiedShow Answer

The textural term for a basaltic lava flow that has a smooth,ropy appearance is ________.

Correct AnswerverifiedA

In 1902,a famous,deadly pyroclastic flow killed thousands of people on the Caribbean island of ________.

Correct AnswerverifiedShow Answer

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A

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C

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A

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