Question 1

Slow cooling produces ________ crystals, whereas fast cooling produces ________ crystals.

Accepted Answer

The answer of Slow cooling produces ________ crystals, whereas fast...

Question 2

Most sills are intrusive igneous structures that display a fine-grained texture.

Accepted Answer

A) True 
 B)False

Question 3

Plutonic bodies that have a surface exposure less than 100 km2 are called ________.

Accepted Answer

A)  dikes
B)  stocks
C)  swarms
D)  batholithsE) B) and C)
F) A) and D)

Question 4

Which of the following best describes a pegmatitic texture?

Accepted Answer

A)  Large crystals that form in a fluid-rich environment late in crystallization
B)  Porous texture resulting from escaping volatiles
C)  Fine-grained texture composed of microscopic crystals
D)  Several large crystals surrounded by a fine-grained matrixE) A) and B)
F) C) and D)

Question 5

Which of the following statements best describes the relationship between pressure and melting point in the Earth's Interior?

Accepted Answer

A)  Higher pressure leads to lower melting points.
B)  Melting points of rocks are not dependent on changes in pressure.
C)  Higher melting points are determined by higher pressures.D) A) and C)
E) A) and B)

Question 6

How does magma differ from lava?

Accepted Answer

Magma is molten rock below the...

Question 7

Refer to the scenario above.How does this gradient compare to the average geothermal gradient?

Accepted Answer

It is slig...

Question 8

What creates the small holes found in a vesicular texture?

Accepted Answer

A)  Liquid water
B)  Volatiles
C)  Soluble minerals
D)  WeatheringE) None of the above
F) A) and B)

Question 9

________ describes the formation of one or more secondary magmas from a single parent magma.

Accepted Answer

A)  Magmatic differentiation
B)  Hydrothermal alteration
C)  Decompression melting
D)  Partial meltingE) A) and B)
F) None of the above

Question 10

________ is a felsic igneous rock with a meringuelike vesicular texture, consisting of very small holes, created by small shards of volcanic glass.

Accepted Answer

A)  Scoria
B)  Obsidian
C)  Granite
D)  PumiceE) All of the above
F) B) and C)

Question 11

________ is molten rock that is below the Earth's surface and retains most of its volcanic gases.

Accepted Answer

A)  Lava
B)  Pumice
C)  Magma
D)  VolatilesE) All of the above
F) A) and B)

Question 12

What three components make up most magmas?

Accepted Answer

A)  Silicon, potassium feldspar, and muscovite
B)  Water, melted rock, and solid crystals
C)  Lava, ash, and gas
D)  Liquid portion, solid portion, gaseous portionE) All of the above
F) A) and B)

Question 13

Which igneous texture has visible crystals that are a few millimeters across?

Accepted Answer

A)  Phaneritic
B)  Aphanitic
C)  Pegmatitic
D)  PorphyriticE) B) and C)
F) A) and D)

Question 14

A ________ texture includes coarse phenocrysts surrounded by a phaneritic groundmass.

Accepted Answer

A)  pegmatitic
B)  porphyritic
C)  glassy
D)  aphaniticE) A) and B)
F) None of the above

Question 15

Follow the geothermal gradient to the depth of 100 km.In which state of matter will peridotite exist at 100 km?

Accepted Answer

The answer of  Follow the geothermal gradient to the...

Question 16

List the intrusive igneous textures below.
Phaneritic, aphanitic, glassy, pyroclastic, pegmatitic

Accepted Answer

Phaneritic...

Question 17

Explain the processes occurring in the figure above that are generating magma.At what kind of tectonic boundary are such processes common?

Accepted Answer

As rifting occurs at the diver...

Question 18

Mineral crystals that form early in the crystallization process will have better-developed crystal faces than later crystals.

Accepted Answer

A) True 
 B)False

Question 19

Will density increase or decrease with the crystallization of a magma?

Accepted Answer

A)  Decrease
B)  IncreaseC) A) and B)
D) undefined

Question 20

What is the geologic definition of texture?

Accepted Answer

A)  How the sample feels to the touch
B)  The mineral content of the sample
C)  The percentage of silica in a sample
D)  Size, shape, and arrangement of mineral grains in the sampleE) All of the above
F) None of the above

Exam 4: Magma, Igneous Rocks, and Intrusive Activity

A ________ texture includes coarse phenocrysts surrounded by a phaneritic groundmass.

Correct AnswerverifiedShow Answer

Slow cooling produces ________ crystals, whereas fast cooling produces ________ crystals.

Correct AnswerverifiedShow Answer

What is the geologic definition of texture?

Correct AnswerverifiedShow Answer

________ describes the formation of one or more secondary magmas from a single parent magma.

Correct AnswerverifiedShow Answer

Mineral crystals that form early in the crystallization process will have better-developed crystal faces than later crystals.

Correct AnswerverifiedShow Answer

What creates the small holes found in a vesicular texture?

Correct AnswerverifiedShow Answer

________ is a felsic igneous rock with a meringuelike vesicular texture, consisting of very small holes, created by small shards of volcanic glass.

Correct AnswerverifiedShow Answer

________ is molten rock that is below the Earth's surface and retains most of its volcanic gases.

Correct AnswerverifiedShow Answer

List the intrusive igneous textures below. Phaneritic, aphanitic, glassy, pyroclastic, pegmatitic

Correct AnswerverifiedPhaneritic...View AnswerShow Answer

Will density increase or decrease with the crystallization of a magma?

Correct AnswerverifiedShow Answer

Which igneous texture has visible crystals that are a few millimeters across?

Correct AnswerverifiedShow Answer

Which of the following best describes a pegmatitic texture?

Correct AnswerverifiedShow Answer

Most sills are intrusive igneous structures that display a fine-grained texture.

Correct AnswerverifiedShow Answer

Which of the following statements best describes the relationship between pressure and melting point in the Earth's Interior?

Correct AnswerverifiedShow Answer

Refer to the scenario above.How does this gradient compare to the average geothermal gradient?

Correct AnswerverifiedIt is slig...View AnswerShow Answer

Follow the geothermal gradient to the depth of 100 km.In which state of matter will peridotite exist at 100 km?

Correct AnswerverifiedShow Answer

Plutonic bodies that have a surface exposure less than 100 km2 are called ________.

Correct AnswerverifiedShow Answer

How does magma differ from lava?

Correct AnswerverifiedMagma is molten rock below the...View AnswerShow Answer

Explain the processes occurring in the figure above that are generating magma.At what kind of tectonic boundary are such processes common?

Correct AnswerverifiedAs rifting occurs at the diver...View AnswerShow Answer

What three components make up most magmas?

Correct AnswerverifiedShow Answer

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Slow cooling produces crystals, whereas fast cooling produces crystals.

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Phaneritic...
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It is slig...
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Plutonic bodies that have a surface exposure less than 100 km² are called ________.

Correct Answer
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Magma is molten rock below the...
View Answer

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As rifting occurs at the diver...
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Correct Answer
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