Question 1

How do the holes form in vesicular igneous rocks,such as scoria and pumice?

Accepted Answer

They result from the entrapmen

Question 2

The most widely accepted explanation for chains of volcanoes in the oceans and lines of volcanoes on land is that they formed at:

Accepted Answer

A) divergent plate boundaries. 
B) normal faults. 
C) hot spots. 
D) convergent plate boundaries. 
E) transform faults. 
A) divergent plate boundaries. 
B) normal faults. 
C) hot spots. 
D) convergent plate boundaries. 
E) transform faults.

Question 3

Explain how a laccolith is similar to a sill.

Accepted Answer

Both are near-surfac

Question 4

____________________ are concordant,mushroom-shaped plutons.

Accepted Answer

The answer of ____________________ are concordant,mushroom-shaped plutons....

Question 5

What does a glassy texture tell us about the history of an igneous rock?

Accepted Answer

The magma

Question 6

The process of assimilation includes the incorporation of felsic country rock.

Accepted Answer

A) True 
 B)False

Question 7

Why can an intruding mafic magma assimilate felsic country rock,but an intruding felsic magma cannot assimilate mafic country rock?

Accepted Answer

Mafic magma has a higher tempe

Question 8

Natural glass,such as obsidian,forms when magma:

Accepted Answer

A) cools too rapidly for crystals to form. 
B) cools rapidly and very tiny crystals form. 
C) cools too slowly for crystals to form. 
D) doesn't cool. 
E) none of these. 
A) cools too rapidly for crystals to form. 
B) cools rapidly and very tiny crystals form. 
C) cools too slowly for crystals to form. 
D) doesn't cool. 
E) none of these.

Question 9

The process of assimilation results in the cooling of an intruding magma.

Accepted Answer

A) True 
 B)False

Question 10

List three processes by which felsic and intermediate igneous rocks can be formed from more mafic magmas.

Accepted Answer

Possibilities includ

Question 11

Mantle plumes are found primarily at:

Accepted Answer

A) divergent plate boundaries. 
B) convergent plate boundaries. 
C) transform plate boundaries. 
D) intraplate regions. 
E) none of the above 
A) divergent plate boundaries. 
B) convergent plate boundaries. 
C) transform plate boundaries. 
D) intraplate regions. 
E) none of the above

Question 12

A dark colored igneous rock with no visible crystals cooled:

Accepted Answer

A) slowly in a magma chamber. 
B) quickly in a magma chamber. 
C) slowly on the Earth's surface. 
D) quickly on the Earth's surface. 
E) none of the these 
A) slowly in a magma chamber. 
B) quickly in a magma chamber. 
C) slowly on the Earth's surface. 
D) quickly on the Earth's surface. 
E) none of the these

Question 13

Large crystals found in a fine-grained groundmass can indicate:

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) origin from a magma with an early intrusive phase followed by an extrusive phase AND a rock of mixed volcanic-plutonic origin. 
E) origin from a magma with an early extrusive phase followed by an intrusive phase AND a rock of mixed volcanic-plutonic origin. 
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) origin from a magma with an early intrusive phase followed by an extrusive phase AND a rock of mixed volcanic-plutonic origin. 
E) origin from a magma with an early extrusive phase followed by an intrusive phase AND a rock of mixed volcanic-plutonic origin.

Question 14

What is a pluton?

Accepted Answer

A body of rock that

Question 15

Why does Bowen's reaction series predict that mafic intrusive rocks should be much more common than felsic intrusive rocks?

Accepted Answer

If crystal settling produces t

Question 16

Why does lava retain heat so well?

Accepted Answer

Because ro

Question 17

Briefly explain why felsic intrusive rocks are actually more common than mafic intrusive rocks.

Accepted Answer

Partial melting of mafic ocean

Question 18

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

Accepted Answer

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

Question 19

The presence of country rock inclusions in an intrusive igneous rock is evidence that the rock underwent the process of ____________________.

Accepted Answer

The answer of The presence of country rock inclusions in...

Question 20

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

Accepted Answer

phenocryst

How do the holes form in vesicular igneous rocks,such as scoria and pumice?

The most widely accepted explanation for chains of volcanoes in the oceans and lines of volcanoes on land is that they formed at:

Explain how a laccolith is similar to a sill.

____________________ are concordant,mushroom-shaped plutons.

What does a glassy texture tell us about the history of an igneous rock?

The process of assimilation includes the incorporation of felsic country rock.

Why can an intruding mafic magma assimilate felsic country rock,but an intruding felsic magma cannot assimilate mafic country rock?

Natural glass,such as obsidian,forms when magma:

The process of assimilation results in the cooling of an intruding magma.

List three processes by which felsic and intermediate igneous rocks can be formed from more mafic magmas.

Mantle plumes are found primarily at:

A dark colored igneous rock with no visible crystals cooled:

Large crystals found in a fine-grained groundmass can indicate:

What is a pluton?

Why does Bowen's reaction series predict that mafic intrusive rocks should be much more common than felsic intrusive rocks?

Why does lava retain heat so well?

Briefly explain why felsic intrusive rocks are actually more common than mafic intrusive rocks.

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

The presence of country rock inclusions in an intrusive igneous rock is evidence that the rock underwent the process of ____________________.

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

Understanding Earth: A Dynamic and Evolving Planet

Plate Tectonics: A Unifying Theory

Minerals: The Building Blocks of Rocks

Volcanoes and Volcanism

Weathering, Soil, and Sedimentary Rocks

Metamorphism and Metamorphic Rocks

Earthquakes and Earths Interior

Deformation, Mountain Building, and the Continents

Mass Wasting

Running Water

Groundwater

Glaciers and Glaciation

The Work of Wind and Deserts

Oceans, Shorelines, and Shoreline Processes

Geologic Time: Concepts and Principles

Earth History

Life History

Filters

Exam 4: Igneous Rocks and Intrusive Igneous Activity

How do the holes form in vesicular igneous rocks,such as scoria and pumice?

The most widely accepted explanation for chains of volcanoes in the oceans and lines of volcanoes on land is that they formed at:

Explain how a laccolith is similar to a sill.

____________________ are concordant,mushroom-shaped plutons.

What does a glassy texture tell us about the history of an igneous rock?

The process of assimilation includes the incorporation of felsic country rock.

Why can an intruding mafic magma assimilate felsic country rock,but an intruding felsic magma cannot assimilate mafic country rock?

Natural glass,such as obsidian,forms when magma:

The process of assimilation results in the cooling of an intruding magma.

List three processes by which felsic and intermediate igneous rocks can be formed from more mafic magmas.

Mantle plumes are found primarily at:

A dark colored igneous rock with no visible crystals cooled:

Large crystals found in a fine-grained groundmass can indicate:

What is a pluton?

Why does Bowen's reaction series predict that mafic intrusive rocks should be much more common than felsic intrusive rocks?

Why does lava retain heat so well?

Briefly explain why felsic intrusive rocks are actually more common than mafic intrusive rocks.

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

The presence of country rock inclusions in an intrusive igneous rock is evidence that the rock underwent the process of ____________________.

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

Understanding Earth: A Dynamic and Evolving Planet

Plate Tectonics: A Unifying Theory

Minerals: The Building Blocks of Rocks

Volcanoes and Volcanism

Weathering, Soil, and Sedimentary Rocks

Metamorphism and Metamorphic Rocks

Earthquakes and Earths Interior

Deformation, Mountain Building, and the Continents

Mass Wasting

Running Water

Groundwater

Glaciers and Glaciation

The Work of Wind and Deserts

Oceans, Shorelines, and Shoreline Processes

Geologic Time: Concepts and Principles

Earth History

Life History

Filters

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