Question 1

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

Accepted Answer

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

Question 2

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)   stratovolcano

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 Plate

Question 4

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

Question 5

Pelé's hair ____________.

Accepted Answer

A)   consists of thin strands of basaltic pyroclastic debris
B)   acquires aerodynamic torpedo-like shapes during flight out of the volcanic vent
C)   forms only at the leading edge of basaltic lava flows
D)   was instrumental in scoring the winning goal to defeat Uruguay in the 1958 World Cup finals

Question 6

Olympus Mons,the largest known volcano in the Universe,is found on ___________.

Accepted Answer

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

Question 7

One of the reasons volcanic eruptions are so deadly is that there is no way to predict where an eruption will occur in the near future.

Accepted Answer

A) True 
 B)False

Question 8

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

Accepted Answer

A) True 
 B)False

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 tuffs

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 become funneled into the crater
C)   fine volcaniclastic debris (ash)  suspended in the air
D)   a continuous fountain of dark, basaltic lava

Question 11

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 assembly

Question 12

Pahoehoe ____________.

Accepted Answer

A)   forms when basaltic lava flows cease flowing and solidify simultaneously
B)   has a smoother texture than a'a'
C)   is easier to walk on than a'a' is
D)   all of the above

Question 13

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

Question 14

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 15

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

Question 16

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

Accepted Answer

A) True 
 B)False

Question 17

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 18

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

Accepted Answer

A)   volcaniclastic debris
B)   lava flows
C)   Pelé's hair
D)   volcanoes

Question 19

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

Question 20

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

Accepted Answer

A)   the viscosity of the lava
B)   the composition of the lava
C)   the proportion of volatiles within the lava
D)   all of the above

Exam 5: The Wrath of Vulcan: Volcanic Eruptions

Most terrestrial volcanic glass ____________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Olympus Mons,the largest known volcano in the Universe,is found on ___________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Pelé's hair ____________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Pahoehoe ____________.

Correct AnswerverifiedShow Answer

One of the reasons volcanic eruptions are so deadly is that there is no way to predict where an eruption will occur in the near future.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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

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

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