Question 1

Fine-grained igneous rocks (grains < 1.0 mm)  that have small grains cooled rapidly and are likely to be _______.

Accepted Answer

A)   extrusive
B)   reclusive
C)   intrusive
D)   obtrusive
E)   preclusiveF) B) and E)
G) All of the above

Question 2

A useful tool illustrating the relationships among igneous, sedimentary, and metamorphic rocks is called the ___.

Accepted Answer

A)   weathering and erosion of surface features
B)   plate tectonic cycle
C)   relationships between preexisting rock
D)   rock cycle
E)   Bowen's reaction seriesF) None of the above
G) A) and B)

Question 3

Granite and ______ are composed predominantly of feldspar and quartz.

Accepted Answer

A)   oceanic crust
B)   diorite
C)   basalt
D)   rhyolite
E)   ultramaficsF) B) and C)
G) A) and B)

Question 4

A dike is a discordant intrusive igneous structure.

Accepted Answer

A) True 
 B)False

Question 5

To explain the great volumes of granite plutonic rocks, most geologists think that partial melting of the _______ must take place.

Accepted Answer

A)   core
B)   lower mantle
C)   lower continental crust
D)   oceanic crust
E)   asthenosphereF) A) and B)
G) B) and C)

Question 6

Pegmatites are extremely coarse-grained igneous rocks.

Accepted Answer

A) True 
 B)False

Question 7

Diorite and andesite are composed of similar amounts of feldspars and ferromagnesian minerals.

Accepted Answer

A) True 
 B)False

Question 8

______ are extremely coarse-grained with crystal up to 10 meters across.

Accepted Answer

A)   Granites
B)   Ultramafic
C)   Basalts
D)   Pegmatites
E)   MarblesF) B) and E)
G) B) and D)

Question 9

Geologists regard basaltic magma (Hawaiian lava, for example)  as the result of the partial melting of ultramafic rock in the ____.

Accepted Answer

A)   oceanic crust
B)   continental crust
C)   mantle
D)   outer core
E)   inner coreF) B) and C)
G) A) and E)

Question 10

Although batholiths may contain mafic and intermediate rocks, they almost never composed of granite.

Accepted Answer

A) True 
 B)False

Question 11

______ is the predominant igneous rock of the continents.

Accepted Answer

A)   Basalt
B)   Granite
C)   Rhyolite
D)   Gabbro
E)   LimestoneF) All of the above
G) D) and E)

Question 12

Mafic magma generated in the _______ rises to the base of the crust.

Accepted Answer

A)   continental crust
B)   outer core
C)   asthenosphere
D)   spreading ridges
E)   mantle plumesF) D) and E)
G) B) and D)

Question 13

Both andesite and ___ are composed of feldspars and 30% to 50% ferromagnesian minerals.

Accepted Answer

A)   granite
B)   diorite
C)   pegmatite
D)   gabbro
E)   rhyoliteF) B) and D)
G) B) and C)

Question 14

What is the process through which magma differentiation takes place?

Accepted Answer

A)   crystal settling
B)   partial melting
C)   viscosity of the magma
D)   heating of the country rock
E)   subductionF) A) and B)
G) B) and D)

Question 15

The huge volume of mafic magma that erupted to form the Columbia plateau basalts of Washington and Oregon are attributed to ___.

Accepted Answer

A)   sea floor spreading
B)   a hot mantle plume
C)   subduction
D)   magma mixing
E)   meteorite impactF) C) and D)
G) A) and B)

Question 16

The continuous branch in Bowen's Reaction Series contains the ferromagnesian minerals.

Accepted Answer

A) True 
 B)False

Question 17

Basaltic magmas crystallize at higher temperatures than granitic magmas.

Accepted Answer

A) True 
 B)False

Question 18

The melting point of a rock decreases with increasing pressure.

Accepted Answer

A) True 
 B)False

Question 19

Ultramafic igneous rocks are composed almost entirely of __.

Accepted Answer

A)   feldspar
B)   quartz
C)   ferromagnesian minerals
D)   calcite
E)   diamondsF) A) and B)
G) B) and E)

Question 20

Extrusive igneous rocks are typically fine grained because they crystallized slowly, deep below the Earth's surface.

Accepted Answer

A) True 
 B)False

Exam 3: Igneous Rocks, Intrusive Activity, and the Origin of Igneous Rocks

Although batholiths may contain mafic and intermediate rocks, they almost never composed of granite.

Correct AnswerverifiedShow Answer

Mafic magma generated in the _______ rises to the base of the crust.

Correct AnswerverifiedShow Answer

______ is the predominant igneous rock of the continents.

Correct AnswerverifiedShow Answer

The continuous branch in Bowen's Reaction Series contains the ferromagnesian minerals.

Correct AnswerverifiedShow Answer

Extrusive igneous rocks are typically fine grained because they crystallized slowly, deep below the Earth's surface.

Correct AnswerverifiedShow Answer

Basaltic magmas crystallize at higher temperatures than granitic magmas.

Correct AnswerverifiedShow Answer

A dike is a discordant intrusive igneous structure.

Correct AnswerverifiedShow Answer

Diorite and andesite are composed of similar amounts of feldspars and ferromagnesian minerals.

Correct AnswerverifiedShow Answer

Geologists regard basaltic magma (Hawaiian lava, for example) as the result of the partial melting of ultramafic rock in the ____.

Correct AnswerverifiedShow Answer

Fine-grained igneous rocks (grains < 1.0 mm) that have small grains cooled rapidly and are likely to be _______.

Correct AnswerverifiedShow Answer

What is the process through which magma differentiation takes place?

Correct AnswerverifiedShow Answer

Granite and ______ are composed predominantly of feldspar and quartz.

Correct AnswerverifiedShow Answer

Ultramafic igneous rocks are composed almost entirely of __.

Correct AnswerverifiedShow Answer

The melting point of a rock decreases with increasing pressure.

Correct AnswerverifiedShow Answer

Pegmatites are extremely coarse-grained igneous rocks.

Correct AnswerverifiedShow Answer

______ are extremely coarse-grained with crystal up to 10 meters across.

Correct AnswerverifiedShow Answer

Both andesite and ___ are composed of feldspars and 30% to 50% ferromagnesian minerals.

Correct AnswerverifiedShow Answer

To explain the great volumes of granite plutonic rocks, most geologists think that partial melting of the _______ must take place.

Correct AnswerverifiedShow Answer

The huge volume of mafic magma that erupted to form the Columbia plateau basalts of Washington and Oregon are attributed to ___.

Correct AnswerverifiedShow Answer

A useful tool illustrating the relationships among igneous, sedimentary, and metamorphic rocks is called the ___.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified