Question 1

Which of the following were involved in bringing the deep batholithic rocks to the surface?

Accepted Answer

A)   uplift of the rocks over tens of millions of years
B)   a hot spot that formed a broad continental plateau
C)   a continent-continent collision with Australia
D)   the recent restarting of subduction beneath the areaE) B) and C)
F) A) and C)

Question 2

Which of the letters shown on this figure would most likely have mafic basalt)  magmas?

Accepted Answer

A)   A and B
B)   A and C
C)   B and D
D)   D and E
E)   C and DF) A) and B)
G) All of the above

Question 3

Which of the following acts to keep a rock solid instead of melting) ?

Accepted Answer

A)   an increase in temperature
B)   an increase in the vibration within a lattice
C)   an increase in confining pressure
D)   none of theseE) A) and B)
F) A) and D)

Question 4

The main way water gets into a subduction zone is by:

Accepted Answer

A)   heating of the overlying continental crust
B)   a decrease in pressure that causes melting
C)   rain associated with eruptions in the island arc
D)   seawater introduced into oceanic crust at the mid-ocean ridge, prior to subduction
E)   all of theseF) B) and E)
G) B) and C)

Question 5

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 DF) All of the above
G) A) and B)

Question 6

Most subduction-derived magma never reaches the surface. However, what is formed if this type of magma reaches oceanic crust?

Accepted Answer

A)   island arcs
B)   mountain ranges
C)   belts of calderasD) A) and B)
E) A) and C)

Question 7

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) All of the above
F) None of the above

Question 8

The main cause of melting along subduction zones is the:

Accepted Answer

A)   rise and decompression melting of mantle lithosphere
B)   rise and decompression melting of mantle asthenosphere
C)   melting of the subducting plate
D)   release of water from the subducting plateE) C) and D)
F) B) and C)

Question 9

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.E) A) and C)
F) B) and C)

Question 10

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 compactedF) None of the above
G) A) and E)

Question 11

Which of the following rock photographs depicts a felsic igneous rock?

Accepted Answer

A)   
B)   
C)   
D)   E) A) and B)
F) None of the above

Question 12

A magma chamber:

Accepted Answer

A)   an underground body of molten rock
B)   an above ground body of solid rock
C)   an underground body of lavaD) All of the above
E) A) and C)

Question 13

Which of the following changes in conditions indicates heating of the rock?

Accepted Answer

A)   from A to B
B)   from B to C
C)   from C to D
D)   from D to A
E)   none of theseF) A) and B)
G) A) and C)

Question 14

The igneous feature shown in this figure is a:

Accepted Answer

A)   dike
B)   sill
C)   volcanic neck
D)   laccolithE) B) and C)
F) A) and D)

Question 15

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) A) and D)
G) D) and E)

Question 16

Which of the following processes has added heat to Earth's interior during or after its formation?

Accepted Answer

A)   collision of asteroids and meteoroids with Earth
B)   formation and sinking of masses of iron and nickel
C)   radioactive decay
D)   all of theseE) All of the above
F) A) and B)

Question 17

Which number on this figure indicates heating by conduction?

Accepted Answer

A)   1, direct contact between the burner and the pan
B)   2, heating by thermal radiation through the air
C)   3, heated water expands and rises to the top of the pan and then cools and flows back down
D)   4, moving a pan of water away from the stoveE) B) and D)
F) C) and D)

Question 18

Minerals crystallize:

Accepted Answer

A)   in the opposite order they melt
B)   in the same order they meltC) A) and B)
D) undefined

Question 19

The site on the accompanying figure that would most likely form a rock that is glassy with no volcanic ash is:

Accepted Answer

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

Question 20

When two plates are moving away from each other they are said to be:

Accepted Answer

A)   diverging
B)   converging
C)   remaining the sameD) None of the above
E) All of the above

Exam 5: Igneous Environments

Which number on this figure indicates heating by conduction?

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A finely crystalline or glassy igneous texture indicates that:

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The main cause of melting along subduction zones is the:

Correct AnswerverifiedShow Answer

How does the addition of water cause melting?

Correct AnswerverifiedShow Answer

When two plates are moving away from each other they are said to be:

Correct AnswerverifiedShow Answer

Which of the following acts to keep a rock solid instead of melting) ?

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 were involved in bringing the deep batholithic rocks to the surface?

Correct AnswerverifiedShow Answer

Most subduction-derived magma never reaches the surface. However, what is formed if this type of magma reaches oceanic crust?

Correct AnswerverifiedShow Answer

Which of the following processes has added heat to Earth's interior during or after its formation?

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

A vesicular igneous texture indicates that:

Correct AnswerverifiedShow Answer

The main way water gets into a subduction zone is by:

Correct AnswerverifiedShow Answer

Which of the letters shown on this figure would most likely have mafic basalt) magmas?

Correct AnswerverifiedShow Answer

A magma chamber:

Correct AnswerverifiedShow Answer

Which of the following changes in conditions indicates heating of the rock?

Correct AnswerverifiedShow Answer

Which of the following rock photographs depicts a felsic igneous rock?

Correct AnswerverifiedShow Answer

The igneous feature shown in this figure is a:

Correct AnswerverifiedShow Answer

Minerals crystallize:

Correct AnswerverifiedShow Answer

The site on the accompanying figure that would most likely form a rock that is glassy with no volcanic ash is:

Correct AnswerverifiedShow Answer

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