Question 1

When a large mineral surrounded by much smaller minerals in an igneous rock,the mineral in question is called a

Accepted Answer

A)  porphyry.
B)  phenocryst.
C)  pumice.
D)  pyroclast.E) A) and C)
F) B) and C)

Question 2

Mantle plumes generate large volumes of ________ magmas.

Accepted Answer

A)  andesitic
B)  peridotitic
C)  rhyolitic
D)  basalticE) All of the above
F) None of the above

Question 3

Large igneous bodies that form at depth in Earth's crust are called

Accepted Answer

A)  dikes.
B)  plutons.
C)  sills.
D)  veins.E) None of the above
F) A) and C)

Question 4

The process whereby two different magmas mix is called

Accepted Answer

A)  rock mixing.
B)  melt mixing.
C)  magma mixing.
D)  magma mingling.E) A) and B)
F) A) and C)

Question 5

Which of the following is not part of an ophiolite suite?

Accepted Answer

A)  basaltic dikes
B)  granitic plutons
C)  deep-sea sediments
D)  massive gabbrosE) None of the above
F) All of the above

Question 6

At what temperature do minerals crystallize in hydrothermal veins?

Accepted Answer

A)  approximately 300°C
B)  approximately 600°C
C)  approximately 900°C
D)  approximately 1500°CE) A) and D)
F) B) and D)

Question 7

Approximately how much volcanic rocks forms annually at subduction zones?

Accepted Answer

A)  0.1 km3
B)  1 km3
C)  20 km3
D)  100 km3E) A) and B)
F) C) and D)

Question 8

For a rock of a specific composition,which of the following statements is true?

Accepted Answer

A)  The amount of partial melt decreases with increasing temperature.
B)  The melting temperature increases with increasing pressure.
C)  The melting temperature increases with increasing water content.
D)  All of the statements above are true.E) C) and D)
F) B) and D)

Question 9

Bowen's Reaction Series describes

Accepted Answer

A)  how fast crystals grow from cooling magmas.
B)  how fast magmas cool.
C)  how magmas react to cooling.
D)  the sequence in which minerals form when magmas cool.E) A) and B)
F) All of the above

Question 10

Which of the following igneous rocks crystallizes at Earth's surface?

Accepted Answer

A)  basalt
B)  gabbro
C)  granite
D)  peridotiteE) A) and C)
F) A) and B)

Question 11

The rock surrounding an intrusive igneous body is referred to as the

Accepted Answer

A)  encasing rock.
B)  enclosing rock.
C)  crustal rock.
D)  country rock.E) A) and D)
F) A) and C)

Question 12

Which of the following types of igneous rocks crystallizes deep within Earth's crust?

Accepted Answer

A)  andesite
B)  basalt
C)  gabbro
D)  rhyoliteE) A) and B)
F) A) and C)

Question 13

Crystal fractionation from basalt cannot by itself account for the global volume of __________ on earth.

Accepted Answer

A)  andesites
B)  gabbros
C)  diorites
D)  granitesE) A) and D)
F) B) and D)

Question 14

Compared with the mantle beneath a mid-ocean ridge,the mantle above a subduction zone

Accepted Answer

A)  contains less water and melts at a lower temperature.
B)  contains less water and melts at a higher temperature.
C)  contains more water and melts at a lower temperature.
D)  contains more water and melts at a higher temperature.E) C) and D)
F) A) and D)

Question 15

Which of the following best describes a rock with 10-millimeter-long plagioclase crystals set in a fine-grained matrix of 0.5-millimeter-long crystals?

Accepted Answer

A)  obsidian
B)  pluton
C)  porphyry
D)  tuffE) A) and C)
F) B) and C)

Question 16

Which igneous rock is the most abundant component of the crust and makes up nearly all of the seafloor?

Accepted Answer

A)  andesite
B)  basalt
C)  granite
D)  peridotiteE) A) and D)
F) None of the above

Question 17

Which of the following minerals is common in both felsic and mafic igneous rocks?

Accepted Answer

A)  olivine
B)  plagioclase feldspar
C)  pyroxene
D)  quartzE) All of the above
F) None of the above

Exam 4: Igneous Rocks: Solids From Melts

Which igneous rock is the most abundant component of the crust and makes up nearly all of the seafloor?

Correct Answer
verified

Which of the following types of igneous rocks crystallizes deep within Earth's crust?

Correct Answer
verified

When a large mineral surrounded by much smaller minerals in an igneous rock,the mineral in question is called a

Correct Answer
verified

For a rock of a specific composition,which of the following statements is true?

Correct Answer
verified

Which of the following is not part of an ophiolite suite?

Correct Answer
verified

Which of the following igneous rocks crystallizes at Earth's surface?

Correct Answer
verified

Which of the following best describes a rock with 10-millimeter-long plagioclase crystals set in a fine-grained matrix of 0.5-millimeter-long crystals?

Correct Answer
verified

Approximately how much volcanic rocks forms annually at subduction zones?

Correct Answer
verified

Large igneous bodies that form at depth in Earth's crust are called

Correct Answer
verified

At what temperature do minerals crystallize in hydrothermal veins?

Correct Answer
verified

The process whereby two different magmas mix is called

Correct Answer
verified

Which of the following minerals is common in both felsic and mafic igneous rocks?

Correct Answer
verified

Bowen's Reaction Series describes

Correct Answer
verified

Mantle plumes generate large volumes of ________ magmas.

Correct Answer
verified

The rock surrounding an intrusive igneous body is referred to as the

Correct Answer
verified

Compared with the mantle beneath a mid-ocean ridge,the mantle above a subduction zone

Correct Answer
verified

Crystal fractionation from basalt cannot by itself account for the global volume of __________ on earth.

Correct Answer
verified

Exam 4: Igneous Rocks: Solids From Melts

Which igneous rock is the most abundant component of the crust and makes up nearly all of the seafloor?

Correct AnswerverifiedShow Answer

Which of the following types of igneous rocks crystallizes deep within Earth's crust?

Correct AnswerverifiedShow Answer

When a large mineral surrounded by much smaller minerals in an igneous rock,the mineral in question is called a

Correct AnswerverifiedShow Answer

For a rock of a specific composition,which of the following statements is true?

Correct AnswerverifiedShow Answer

Which of the following is not part of an ophiolite suite?

Correct AnswerverifiedShow Answer

Which of the following igneous rocks crystallizes at Earth's surface?

Correct AnswerverifiedShow Answer

Which of the following best describes a rock with 10-millimeter-long plagioclase crystals set in a fine-grained matrix of 0.5-millimeter-long crystals?

Correct AnswerverifiedShow Answer

Approximately how much volcanic rocks forms annually at subduction zones?

Correct AnswerverifiedShow Answer

Large igneous bodies that form at depth in Earth's crust are called

Correct AnswerverifiedShow Answer

At what temperature do minerals crystallize in hydrothermal veins?

Correct AnswerverifiedShow Answer

The process whereby two different magmas mix is called

Correct AnswerverifiedShow Answer

Which of the following minerals is common in both felsic and mafic igneous rocks?

Correct AnswerverifiedShow Answer

Bowen's Reaction Series describes

Correct AnswerverifiedShow Answer

Mantle plumes generate large volumes of ________ magmas.

Correct AnswerverifiedShow Answer

The rock surrounding an intrusive igneous body is referred to as the

Correct AnswerverifiedShow Answer

Compared with the mantle beneath a mid-ocean ridge,the mantle above a subduction zone

Correct AnswerverifiedShow Answer

Crystal fractionation from basalt cannot by itself account for the global volume of __________ on earth.

Correct AnswerverifiedShow Answer

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