Question 1

Which of the following igneous rocks can be composed of fragments?

Accepted Answer

A)  tuff
B)  scoria
C)  volcanic breccia
D)  all of these

Question 2

Which of the following igneous rocks is NOT characteristic of mid-ocean ridges?

Accepted Answer

A)  finely crystalline rocks that formed in dikes
B)  gabbro that solidified in a magma chamber
C)  pillow basalt
D)  andesite and granodiorite

Question 3

Which letter in this classification table indicates the position of basalt?

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  E

Question 4

Which of the following minerals would likely crystallize early from magma?

Accepted Answer

A)  mafic minerals
B)  quartz
C)  muscovite
D)  potassium feldspar

Question 5

An igneous pegmatite indicates that:

Accepted Answer

A)  there was water in the magma
B)  the rock cooled slowly and then quickly
C)  the rock broke apart as it flowed
D)  the rock cooled quickly
E)  the ash and pumice were hot and became compacted

Question 6

Which of the following photographs depicts an igneous rock where the magma cooled slowly at first and then had fast cooling?

Accepted Answer

A)   
B)   
C)   
D)

Question 7

What texture is displayed by the igneous rock in this photograph?

Accepted Answer

A)  vesicles
B)  breccia
C)  porphyritic
D)  glassy
E)  none of these

Question 8

The site on the accompanying figure that would most likely form a rock that has a welded texture is:

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  E

Question 9

Which of the following is an example of heat transfer by convection?

Accepted Answer

A)  water within a pan is heated and flows in a circular path
B)  seawater is drawn into a mid-ocean ridge,heated,and rises
C)  the rise of material beneath mid-ocean ridges coupled with subduction
D)  all of these

Question 10

Which of the following changes in conditions could represent melting of continental crust from the introduction of a mafic magma?

Accepted Answer

A)  from A to B
B)  from A to C
C)  from A to D
D)  from C to B
E)  from B to D

Question 11

A vesicular igneous texture indicates that:

Accepted Answer

A)  there was a lot of gas in the magma
B)  the rock cooled quickly
C)  the rock broke apart as it flowed
D)  the rock cooled slowly
E)  the ash and pumice were hot and became compacted

Question 12

What generally happens when subduction-derived magma encounters thick continental crust?

Accepted Answer

A)  most magma reaches the surface with minor modification
B)  the magma solidifies in sheeted dikes with a composition of basalt
C)  the magma interacts with the crust,forming felsic or intermediate compositions
D)  the oceanic crust melts

Question 13

Which of the following is true about igneous processes along oceanic divergent boundaries as shown in this figure?

Accepted Answer

A)  Oceanic crust moves toward the ridge in a conveyor-belt manner.
B)  Most of the mantle is molten,not solid.
C)  Solid asthenosphere rises as plates move apart.
D)  Magma generated in the crust drips down into the mantle.

Question 14

On this figure of Bowen's Reaction Series,which mineral would crystallize last from magma?

Accepted Answer

A)  1,olivine
B)  2,calcium-rich plagioclase
C)  3,sodium-rich plagioclase
D)  4,K-feldspar

Question 15

Which of the following causes magma to be less viscous?

Accepted Answer

A)  a lower temperature
B)  fewer silicate chains in the magma
C)  a more felsic composition
D)  a higher percentage of crystals
E)  none of these

Question 16

Which number of this figure indicates transfer of thermal energy by conduction?

Accepted Answer

A)  1,heating of adjacent rocks by a magma
B)  2,cooling of hot lithosphere by contact with cooler rocks and seawater
C)  3,heating of the subducted plate by contact with hotter overlying materials
D)  all of these

Question 17

Which of the following igneous rocks would be formed by the fastest cooling?

Accepted Answer

A)  very coarse granite pegmatite
B)  coarse granite
C)  medium-grained granite
D)  fine-grained granite
E)  volcanic glass

Question 18

Which of the following igneous rocks would be formed by the slowest cooling?

Accepted Answer

A)  coarse granite
B)  medium-grained granite
C)  fine-grained granite
D)  volcanic glass
E)  there is not enough information to tell

Question 19

Which of the following occurs during a continental collision,after any subduction has ended?

Accepted Answer

A)  the descending continental plate gets hotter and decreases in pressure
B)  decreasing pressure causes downgoing crust to melt
C)  volcanoes are widespread above continental collisions
D)  all of these
E)  none of these

Question 20

What is a path for magma as it solidifies at great depth and then is uplifted slowly toward the surface?

Accepted Answer

A)  from B to A
B)  from C to A
C)  from C to B to A
D)  from D to C to B
E)  from D to C to A

Exam 5: Igneous Environments

Which number of this figure indicates transfer of thermal energy by conduction?

Correct AnswerverifiedShow Answer

Which of the following is an example of heat transfer by convection?

Correct AnswerverifiedShow Answer

Which letter in this classification table indicates the position of basalt?

Correct AnswerverifiedShow Answer

Which of the following igneous rocks would be formed by the slowest cooling?

Correct AnswerverifiedShow Answer

The site on the accompanying figure that would most likely form a rock that has a welded texture is:

Correct AnswerverifiedShow Answer

Which of the following is true about igneous processes along oceanic divergent boundaries as shown in this figure?

Correct AnswerverifiedShow Answer

Which of the following igneous rocks can be composed of fragments?

Correct AnswerverifiedShow Answer

Which of the following causes magma to be less viscous?

Correct AnswerverifiedShow Answer

What texture is displayed by the igneous rock in this photograph?

Correct AnswerverifiedShow Answer

Which of the following igneous rocks is NOT characteristic of mid-ocean ridges?

Correct AnswerverifiedShow Answer

Which of the following changes in conditions could represent melting of continental crust from the introduction of a mafic magma?

Correct AnswerverifiedShow Answer

What generally happens when subduction-derived magma encounters thick continental crust?

Correct AnswerverifiedShow Answer

Which of the following photographs depicts an igneous rock where the magma cooled slowly at first and then had fast cooling?

Correct AnswerverifiedShow Answer

What is a path for magma as it solidifies at great depth and then is uplifted slowly toward the surface?

Correct AnswerverifiedShow Answer

Which of the following occurs during a continental collision,after any subduction has ended?

Correct AnswerverifiedShow Answer

An igneous pegmatite indicates that:

Correct AnswerverifiedShow Answer

A vesicular igneous texture indicates that:

Correct AnswerverifiedShow Answer

On this figure of Bowen's Reaction Series,which mineral would crystallize last from magma?

Correct AnswerverifiedShow Answer

Which of the following minerals would likely crystallize early from magma?

Correct AnswerverifiedShow Answer

Which of the following igneous rocks would be formed by the fastest cooling?

Correct AnswerverifiedShow Answer

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