Question 1

At which of the sites shown in this figure would melting probably be caused by introduction of water into hot rocks?

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  EF) A) and E)
G) B) and D)

Question 2

A finely crystalline or glassy 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 compactedF) None of the above
G) A) and E)

Question 3

What does the texture of this rock indicate about its cooling history? The magma cooled:

Accepted Answer

A)  entirely at the surface
B)  for a while at some depth and then rose to the surface where it finished solidifying
C)  slowly under relatively deep conditions
D)  slowly in the presence of waterE) A) and B)
F) A) and C)

Question 4

Coarsely crystalline igneous textures indicate 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 compactedF) B) and E)
G) None of the above

Question 5

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

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  EF) B) and C)
G) A) and E)

Question 6

Which of the following changes in conditions represents the main cause of melting beneath mid-ocean ridges?

Accepted Answer

A)  from A to B
B)  from A to C
C)  from A to D
D)  from C to B
E)  from D to BF) A) and D)
G) C) and E)

Question 7

What is typically occurring when magmatism occurs far away from plate boundaries?

Accepted Answer

A)  new oceanic crust is created at mid-ocean ridges
B)  large volcanoes are built above subduction zones
C)  some type of thermal disturbance is occurring in the mantle
D)  all of theseE) B) and D)
F) B) and C)

Question 8

Which of the following changes in conditions would represent heating during burial?

Accepted Answer

A)  from A to B
B)  from B to C
C)  from C to D
D)  from D to A
E)  from A to CF) A) and B)
G) A) and C)

Question 9

Which of the following processes could result in a felsic magma?

Accepted Answer

A)  partial melting of an intermediate-composition source
B)  partial melting of continental crust
C)  formation and settling of mafic crystals in an intermediate magma
D)  all of theseE) B) and D)
F) A) and C)

Question 10

Which of the magma systems shown is likely to contain mostly basalt?

Accepted Answer

A)  A
B)  B
C)  C
D)  all of the locations
E)  locations A and B onlyF) A) and B)
G) A) and C)

Question 11

How does the addition of water cause melting?

Accepted Answer

A)  it heats the rocks
B)  it decreases the pressure on the rocks
C)  it increases the temperature while decreasing the pressure
D)  it changes the location of the liquid-solid boundaryE) None of the above
F) All of the above

Question 12

A volcanic neck can form by:

Accepted Answer

A)  erosion of the volcano,leaving behind the solidified conduit inside the volcano
B)  erosion of overlying rock layers exposing the conduit below the volcano
C)  both of theseD) All of the above
E) A) and B)

Question 13

A mantle plume rises because:

Accepted Answer

A)  it is mostly molten
B)  it is solid but less dense than material around it
C)  it is molten and more dense than material around it
D)  it is propelled upward by gas coming out of the magmaE) A) and C)
F) A) and D)

Question 14

Hot spots in oceanic settings typically produce:

Accepted Answer

A)  flood basalts in the middle of a continent
B)  huge caldera explosions
C)  island arcs
D)  lines or clusters of volcanic islandsE) B) and D)
F) A) and B)

Question 15

Which of the following is likely to be true about the magma that formed the left volcanic feature compared to the right one in this figure?

Accepted Answer

A)  the magma has a higher viscosity
B)  the magma has a higher silicate content
C)  the magma is probably more felsic
D)  all of theseE) A) and B)
F) C) and D)

Question 16

The igneous feature shown in this photograph is:

Accepted Answer

A)  dike
B)  sill
C)  volcanic neck
D)  batholithE) None of the above
F) A) and B)

Question 17

Which of the following changes in conditions would cause melting of a solid rock?

Accepted Answer

A)  from A to B
B)  from B to C
C)  from C to D
D)  from A to D
E)  from A to CF) A) and D)
G) C) and D)

Question 18

Which of the following rock photographs depicts an igneous rock that trapped gas?

Accepted Answer

A)   
B)   
C)   
D)   E) A) and B)
F) A) and C)

Question 19

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

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  EF) None of the above
G) C) and E)

Question 20

How could a rock at point C be melted?

Accepted Answer

A)  increase in temperature
B)  decrease in pressure
C)  increase in temperature accompanied by a decrease in pressure
D)  all of theseE) A) and C)
F) B) and C)

Exam 5: Igneous Environments

Hot spots in oceanic settings typically produce:

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Which of the magma systems shown is likely to contain mostly basalt?

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A finely crystalline or glassy igneous texture indicates that:

Correct AnswerverifiedShow Answer

Which of the following changes in conditions represents the main cause of melting beneath mid-ocean ridges?

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

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What does the texture of this rock indicate about its cooling history? The magma cooled:

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

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Which of the following changes in conditions would cause melting of a solid rock?

Correct AnswerverifiedShow Answer

Which of the following is likely to be true about the magma that formed the left volcanic feature compared to the right one in this figure?

Correct AnswerverifiedShow Answer

Which of the following changes in conditions would represent heating during burial?

Correct AnswerverifiedShow Answer

Coarsely crystalline igneous textures indicate that:

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How could a rock at point C be melted?

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The igneous feature shown in this photograph is:

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Which of the following processes could result in a felsic magma?

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At which of the sites shown in this figure would melting probably be caused by introduction of water into hot rocks?

Correct AnswerverifiedShow Answer

Which of the following rock photographs depicts an igneous rock that trapped gas?

Correct AnswerverifiedShow Answer

What is typically occurring when magmatism occurs far away from plate boundaries?

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A mantle plume rises because:

Correct AnswerverifiedShow Answer

How does the addition of water cause melting?

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A volcanic neck can form by:

Correct AnswerverifiedShow Answer

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