Question 1

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) C) and D)
G) B) and D)

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) A) and C)

Question 3

Which of the magma systems shown is most likely to include felsic or intermediate magmas?

Accepted Answer

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

Question 4

What does this texture indicate about the formation of this rock?

Accepted Answer

A)  It formed from an explosive pyroclastic eruption.
B)  The rock solidified at great depth.
C)  The magma formed some crystals before rising closer to the surface and solidifying.
D)  The magma had abundant dissolved gas.E) All of the above
F) B) and C)

Question 5

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 D)
G) All of the above

Question 6

Which of the letters shown on this figure would most likely have magma related to subduction?

Accepted Answer

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

Question 7

The igneous feature shown in this figure is a:

Accepted Answer

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

Question 8

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

Accepted Answer

A)  vesicles
B)  breccia
C)  porphyritic
D)  glassy
E)  none of theseF) B) and C)
G) B) and D)

Question 9

Which of the letters shown on this figure would most likely have magmas related to a hot spot?

Accepted Answer

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

Question 10

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

Accepted Answer

A)  vesicles
B)  breccia
C)  porphyritic
D)  glassy
E)  none of theseF) A) and D)
G) B) and D)

Question 11

Which of the following is NOT a way that magma can lose heat to begin solidifying?

Accepted Answer

A)  conduction to surrounding solid rocks
B)  loss of thermal energy to the air and water
C)  water that is heated and circulated near the magma
D)  an increase in the rate of radioactive decayE) C) and D)
F) A) and C)

Question 12

Which of the following is the best example of heat transfer by conduction?

Accepted Answer

A)  newly created lithosphere loses heat to adjacent rocks
B)  water flows in a circular path in a pan
C)  a burner gives heat through the air without touching the object
D)  seawater is drawn into a mid-ocean ridgeE) B) and C)
F) A) and B)

Question 13

The igneous rocks shown in this photograph are forming:

Accepted Answer

A)  a dike
B)  an irregular pluton
C)  a volcanic neck
D)  columnar jointsE) C) and D)
F) B) and D)

Question 14

Which are important ways that magma can raise through the crust?

Accepted Answer

A)  through fractures that can form dikes
B)  pieces of the wall rocks that break off and provide space
C)  tectonic forces can help open pathways
D)  magma is hotter and less dense than its surrounding
E)  all of theseF) A) and C)
G) None of the above

Question 15

Which of the following was NOT involved in forming magmas of the main batholith?

Accepted Answer

A)  subduction beneath western North America
B)  water that caused partial melting of hot mantle
C)  partial melting of continental crust
D)  solidification of magma below the surface
E)  recent normal faulting along the east side of the batholithF) A) and C)
G) A) and B)

Question 16

The main process that happens during the alpha type of radioactive decay is:

Accepted Answer

A)  an electron is given off
B)  an electron is absorbed and turned into a neutron
C)  an atom splits into two pieces
D)  an alpha particle combines with a small atom to make a larger oneE) B) and C)
F) A) and D) C

Question 17

Which of the following factors helps magma rise toward Earth's surface?

Accepted Answer

A)  pressure decreases with increasing depth
B)  magma is more dense and therefore tougher than the surrounding solid rocks
C)  gas bubbles generally form at great depth and drive magma upward
D)  none of theseE) All of the above
F) A) and C)

Question 18

A hot spot is interpreted to have formed from:

Accepted Answer

A)  extreme heating of the seas near the equator
B)  abundant magma produced within a subduction zone
C)  abundant magma formed within a typical mid-ocean ridge
D)  a rising plume of hot mantle materialE) A) and B)
F) None of the above D

Question 19

A volcanic breccia 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) B) and C)
G) B) and D)

Question 20

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) C) and E)
G) A) and E)

Exam 5: Igneous Environments

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the magma systems shown is most likely to include felsic or intermediate magmas?

Correct AnswerverifiedE

What does this texture indicate about the formation of this rock?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the letters shown on this figure would most likely have magma related to subduction?

Correct AnswerverifiedShow Answer

The igneous feature shown in this figure is a:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the letters shown on this figure would most likely have magmas related to a hot spot?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is NOT a way that magma can lose heat to begin solidifying?

Correct AnswerverifiedShow Answer

Which of the following is the best example of heat transfer by conduction?

Correct AnswerverifiedShow Answer

The igneous rocks shown in this photograph are forming:

Correct AnswerverifiedShow Answer

Which are important ways that magma can raise through the crust?

Correct AnswerverifiedShow Answer

Which of the following was NOT involved in forming magmas of the main batholith?

Correct AnswerverifiedShow Answer

The main process that happens during the alpha type of radioactive decay is:

Correct AnswerverifiedC

Which of the following factors helps magma rise toward Earth's surface?

Correct AnswerverifiedShow Answer

A hot spot is interpreted to have formed from:

Correct AnswerverifiedD

A volcanic breccia texture indicates that:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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E

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C

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D

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