Question 1

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 (gravity d

Question 2

At a linear volcanic chain, such as the Hawaiian Islands, the rocks are oldest over the hot spot and become progressively younger away from the hot spot.

Accepted Answer

A) True 
 B)False

Question 3

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 4

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

Accepted Answer

The magma

Question 5

What two types of volcanic features result from volcanism above a mantle plume? How are hot spots related to plate boundaries?

Accepted Answer

Mantle plumes are responsible for linear

Question 6

How does lava differ from magma?

Accepted Answer

Lava is magma at Earth's surfa

Question 7

What is viscosity? What is the effect of temperature and composition on the viscosity of magma? At the same temperature, which composition of magma will be the most viscous: felsic, intermediate, or mafic? Which will be the least viscous?

Accepted Answer

Viscosity is resistance to flow. Higher

Question 8

What are aphanitic and phaneritic textures, and what do they say about the way the rock formed?

Accepted Answer

Aphanitic also referred to as fine-grain

Question 9

Although all compositions are represented, most plutons are:

Accepted Answer

A)  felsic rocks. 
B)  intermediate rocks. 
C)  mafic rocks. 
D)  felsic and mafic rocks. 
E)  felsic, intermediate, and mafic rocks. 
A)  felsic rocks. 
B)  intermediate rocks. 
C)  mafic rocks. 
D)  felsic and mafic rocks. 
E)  felsic, intermediate, and mafic rocks.

Question 10

What causes volcanism at a subduction zone, and how does Bowen's reaction series explain the composition of the magmas there?

Accepted Answer

According to Bowen's reaction series not

Question 11

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

Accepted Answer

There are three ways for magma to yield

Question 12

Completion 
Igneous rocks of dark color are generally rich in the chemical elements ____________________ and ____________________, while those of light color are generally rich in ____________________ and ____________________.

Accepted Answer

Fe, Mg, Si, Al,Mg, F

Question 13

What phenomena does Bowen's reaction series help explain?

Accepted Answer

Bowen's reaction series explains how mag

Question 14

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

Accepted Answer

The answer of Concordant tabular sheetlike plutons are called ____________________,...

Question 15

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 16

Why do pegmatite mineral crystals grow so large?

Accepted Answer

The water-rich magma inhibits

Question 17

Batholiths are mostly emplaced by _________________ _________________ as magma moves upward into country rock.

Accepted Answer

The answer of Batholiths are mostly emplaced by _________________ _________________...

Question 18

How are gabbro and basalt similar, and how are they different? How about diorite and andesite? Granite and rhyolite? How are basalt, andesite, and rhyolite the same and how are they different? How about gabbro, diorite, and granite?

Accepted Answer

Gabbro and basalt are both mafic rocks (

Question 19

What causes the volcanism at spreading ridges?

Accepted Answer

Beneath spreading ridges, the temperatur

Question 20

What is viscosity?

Accepted Answer

Viscosity

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

At a linear volcanic chain, such as the Hawaiian Islands, the rocks are oldest over the hot spot and become progressively younger away from the hot spot.

Natural glass, such as obsidian, forms when magma:

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

What two types of volcanic features result from volcanism above a mantle plume? How are hot spots related to plate boundaries?

How does lava differ from magma?

What is viscosity? What is the effect of temperature and composition on the viscosity of magma? At the same temperature, which composition of magma will be the most viscous: felsic, intermediate, or mafic? Which will be the least viscous?

What are aphanitic and phaneritic textures, and what do they say about the way the rock formed?

Although all compositions are represented, most plutons are:

What causes volcanism at a subduction zone, and how does Bowen's reaction series explain the composition of the magmas there?

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

Completion Igneous rocks of dark color are generally rich in the chemical elements and , while those of light color are generally rich in and .

What phenomena does Bowen's reaction series help explain?

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

A dark-colored igneous rock with no visible crystals cooled:

Why do pegmatite mineral crystals grow so large?

Batholiths are mostly emplaced by _ _ as magma moves upward into country rock.

How are gabbro and basalt similar, and how are they different? How about diorite and andesite? Granite and rhyolite? How are basalt, andesite, and rhyolite the same and how are they different? How about gabbro, diorite, and granite?

What causes the volcanism at spreading ridges?

What is viscosity?

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

Shorelines and Shoreline Processes

Geologic Time: Concepts and Principles

Earth History

Life History

Filters

Exam 4: Igneous Rocks and Intrusive Igneous Activity

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

At a linear volcanic chain, such as the Hawaiian Islands, the rocks are oldest over the hot spot and become progressively younger away from the hot spot.

Natural glass, such as obsidian, forms when magma:

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

What two types of volcanic features result from volcanism above a mantle plume? How are hot spots related to plate boundaries?

How does lava differ from magma?

What is viscosity? What is the effect of temperature and composition on the viscosity of magma? At the same temperature, which composition of magma will be the most viscous: felsic, intermediate, or mafic? Which will be the least viscous?

What are aphanitic and phaneritic textures, and what do they say about the way the rock formed?

Although all compositions are represented, most plutons are:

What causes volcanism at a subduction zone, and how does Bowen's reaction series explain the composition of the magmas there?

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

Completion Igneous rocks of dark color are generally rich in the chemical elements ____________________ and ____________________, while those of light color are generally rich in ____________________ and ____________________.

What phenomena does Bowen's reaction series help explain?

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

A dark-colored igneous rock with no visible crystals cooled:

Why do pegmatite mineral crystals grow so large?

Batholiths are mostly emplaced by _________________ _________________ as magma moves upward into country rock.

How are gabbro and basalt similar, and how are they different? How about diorite and andesite? Granite and rhyolite? How are basalt, andesite, and rhyolite the same and how are they different? How about gabbro, diorite, and granite?

What causes the volcanism at spreading ridges?

What is viscosity?

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

Shorelines and Shoreline Processes

Geologic Time: Concepts and Principles

Earth History

Life History

Filters

Completion Igneous rocks of dark color are generally rich in the chemical elements and , while those of light color are generally rich in and .

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

Batholiths are mostly emplaced by _ _ as magma moves upward into country rock.