Question 1

How does a batholith differ from a stock?

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Question 2

Name some common uses of granitic rocks.

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Question 3

How did Shiprock,New Mexico form?

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Question 4

The two main categories of igneous rocks are ____________________ and ____________________.

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Question 5

Large crystals found in a fine-grained groundmass can indicate what?

Accepted Answer

A)  origin from a magma with an early intrusive phase followed by an extrusive phase 
B)  origin from a magma with an early extrusive phase followed by an intrusive phase 
C)  a rock of mixed volcanic-plutonic origin 
D)  intrusive slow cooling 
E)  origin from a magma with an early intrusive phase followed by an extrusive phase; a rock of mixed volcanic-plutonic origin

Question 6

Igneous rocks formed by explosive volcanic activity have a texture that is termed what?

Accepted Answer

A)  aphanitic 
B)  porphyritic 
C)  glassy 
D)  phaneritic 
E)  pyroclastic

Question 7

Intrusive igneous (plutonic)rocks ____.

Accepted Answer

A)  solidify below the surface of the ground 
B)  solidify above the surface of the ground 
C)  form by crystallization of magmas intruded into surrounding rocks 
D)  solidify below the surface AND form by crystallization of intruded magmas 
E)  solidify above the surface AND form by crystallization of intruded magmas

Question 8

Briefly explain how it is possible for a single magma to yield rocks of felsic,intermediate,and mafic composition.

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Question 9

The only minerals in the continuous branch of Bowen's reaction series are the ____________________.

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Question 10

Briefly explain why Bowen's reaction series predicts that mafic intrusive rocks should be much more common than felsic intrusive rocks.

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Question 11

An igneous rock in which large mineral grains called ____________________ are suspended in a finely crystalline groundmass is called a(n)____________________.

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Question 12

What are flood basalts?

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Question 13

Partial melting of basalt,together with the processes of assimilation,____________________settling,and ____________________ mixing are believed to explain the generation of felsic intrusive magmas from ____________________ magmas.

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Question 14

Concordant tabular sheetlike plutons are called ____________________,whereas discordant tabular plutons are called ____________________.

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Question 15

Why do pegmatite mineral crystals grow so large?

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Question 16

Batholiths are emplaced by forceful injection as magma moves upward through country rock.

Accepted Answer

A) True 
 B)False

Question 17

What is a pluton?

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Question 18

What is the average geothermal gradient for Earth?

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Question 19

Trapped gases in cooling lava form cavities called ____________________.Cinder cones may contain large amounts of ____________________ which contains more of these cavities than it does rock.

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Question 20

Batholiths and stocks can be important sources of minerals such as ____________________ and ____________________.

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Exam 4: Igneous Rocks and Plutons

How does a batholith differ from a stock?

Name some common uses of granitic rocks.

How did Shiprock,New Mexico form?

The two main categories of igneous rocks are and .

Large crystals found in a fine-grained groundmass can indicate what?

Igneous rocks formed by explosive volcanic activity have a texture that is termed what?

Intrusive igneous (plutonic) rocks ____.

Briefly explain how it is possible for a single magma to yield rocks of felsic,intermediate,and mafic composition.

The only minerals in the continuous branch of Bowen's reaction series are the ____________________.

Briefly explain why Bowen's reaction series predicts that mafic intrusive rocks should be much more common than felsic intrusive rocks.

An igneous rock in which large mineral grains called are suspended in a finely crystalline groundmass is called a(n).

What are flood basalts?

Partial melting of basalt,together with the processes of assimilation,settling,and mixing are believed to explain the generation of felsic intrusive magmas from magmas.

Concordant tabular sheetlike plutons are called ,whereas discordant tabular plutons are called .

Why do pegmatite mineral crystals grow so large?

Batholiths are emplaced by forceful injection as magma moves upward through country rock.

What is a pluton?

What is the average geothermal gradient for Earth?

Trapped gases in cooling lava form cavities called .Cinder cones may contain large amounts of which contains more of these cavities than it does rock.

Batholiths and stocks can be important sources of minerals such as and .