Question 1

The coarse-grained equivalent of basalt is a(n) ______.

Accepted Answer

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

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

The melting point of a mineral generally _____ with increasing pressure (or depth) .

Accepted Answer

A)  does not change
B)  decreases
C)  increases
D)  becomes dependent on rock type
E)  is unknownF) B) and E)
G) A) and E)

Question 4

_____ rocks have coarse crystals in a fine-grained matrix.

Accepted Answer

A)  Ultramafic
B)  Granite
C)  Sill
D)  Pegmatite
E)  PorphyriticF) C) and E)
G) C) and D)

Question 5

______ 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 D)
G) A) and B)

Question 6

________ lava is largely restricted to narrow zones along convergent plate boundaries.

Accepted Answer

A)  Granite
B)  Andesite
C)  Rhyolite
D)  Ultramafic
E)  CarbonateF) C) and D)
G) C) and E)

Question 7

A mineral's melting point generally increases with increasing pressure.

Accepted Answer

A) True 
 B)False

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

How is a sill different from a dike?

Accepted Answer

A)  The sill is tabular in shape.
B)  Dikes are intrusive structures.
C)  Dikes are fine-grained and sills are coarse-grained.
D)  Sills are parallel to the layering in the country rock.
E)  A sill is shaped like a mattress,while a dike is shaped like a pillow.F) A) and D)
G) A) and C)

Question 10

Granite and ______ are composed predominantly of feldspar and quartz.

Accepted Answer

A)  oceanic crust
B)  diorite
C)  basalt
D)  rhyolite
E)  ultramaficsF) A) and D)
G) None of the above

Question 11

______ is the predominant igneous rock of the continents.

Accepted Answer

A)  Basalt
B)  Granite
C)  Rhyolite
D)  Gabbro
E)  LimestoneF) A) and B)
G) A) and C)

Question 12

Most of the basalt and gabbro on the ocean floor is created at mid oceanic ridges,which are also ____.

Accepted Answer

A)  divergent plate boundaries
B)  ocean-ocean convergent plate boundaries
C)  transform plate boundaries
D)  ocean-continent plate boundaries
E)  intraplate igneous areasF) C) and D)
G) A) and D)

Question 13

Rhyolite is considerably more common than granite.

Accepted Answer

A) True 
 B)False

Question 14

_____,a coarse-grained rock composed of pyroxene and olivine,is the most abundant ultramafic rock.

Accepted Answer

A)  Diorite
B)  Gabbro
C)  Granite
D)  Peridotite
E)  HematiteF) None of the above
G) A) and B)

Question 15

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) C) and E)
G) B) and C)

Question 16

Mafic igneous rocks are silica-poor.

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

Igneous rocks that are silica-rich with high aluminum,sodium,and potassium are _____ rocks.

Accepted Answer

A)  silicic
B)  ultramafic
C)  mafic
D)  extraterrestrial
E)  intermediateF) C) and D)
G) B) and E)

Question 19

___ are igneous rocks that are silica-deficient but high in iron and magnesium.

Accepted Answer

A)  Felsic
B)  Intermediate
C)  Oxide
D)  Mafic
E)  SulfateF) A) and E)
G) B) and E)

Question 20

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

Accepted Answer

A) True 
 B)False

Exam 11: Igneous Rocks, Intrusive Activity, and the Origin of Igneous Rocks

The coarse-grained equivalent of basalt is a(n) ______.

Correct AnswerverifiedShow Answer

_____ rocks have coarse crystals in a fine-grained matrix.

Correct AnswerverifiedShow Answer

A mineral's melting point generally increases with increasing pressure.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

______ is the predominant igneous rock of the continents.

Correct AnswerverifiedShow Answer

Igneous rocks that are silica-rich with high aluminum,sodium,and potassium are _____ rocks.

Correct AnswerverifiedShow Answer

Granite and ______ are composed predominantly of feldspar and quartz.

Correct AnswerverifiedShow Answer

Most of the basalt and gabbro on the ocean floor is created at mid oceanic ridges,which are also ____.

Correct AnswerverifiedShow Answer

Mafic igneous rocks are silica-poor.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

___ are igneous rocks that are silica-deficient but high in iron and magnesium.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

________ lava is largely restricted to narrow zones along convergent plate boundaries.

Correct AnswerverifiedShow Answer

_____,a coarse-grained rock composed of pyroxene and olivine,is the most abundant ultramafic rock.

Correct AnswerverifiedShow Answer

Rhyolite is considerably more common than granite.

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

Basaltic magmas crystallize at higher temperatures than granitic magmas.

Correct AnswerverifiedShow Answer

The melting point of a mineral generally _____ with increasing pressure (or depth) .

Correct AnswerverifiedShow Answer

How is a sill different from a dike?

Correct AnswerverifiedShow Answer

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