Question 1

The mineral crystals in phaneritic rocks cannot be distinguished without the aid of a microscope.

Accepted Answer

A) True 
 B)False  False

Question 2

98% of most common crustal igneous rocks are made of ________.

Accepted Answer

A) oxygen, silicon, aluminum, calcium, sodium, potassium, magnesium, and iron 
B) oxygen, hydrogen, nitrogen carbon, and sulfur 
C) titanium, manganese, gold, silver, and uranium 
D) lithium, cesium, uranium, and rare earths 
A) oxygen, silicon, aluminum, calcium, sodium, potassium, magnesium, and iron 
B) oxygen, hydrogen, nitrogen carbon, and sulfur 
C) titanium, manganese, gold, silver, and uranium 
D) lithium, cesium, uranium, and rare earths A

Question 3

Briefly explain why the minerals that crystallize at about the same temperature in Bowen's reaction series are found together in particular igneous rocks.

Accepted Answer

Igneous rocks form by crystallization in order of decreasing melting points of minerals.Olivine, pyroxene and calcic plagioclase crystallize at high temperature and make up basalts and gabbros.Quartz, alkali feldspar and muscovite crystallize at low temperatures and make up granites.

Question 4

Lava is just magma that has been released to or erupted onto the surface of the Earth.

Accepted Answer

A) True 
 B)False

Question 5

Examine the words and/or phrases for each question below and determine the relationship among the majority of words/phrases.
-Choose the option that does not fit the pattern.

Accepted Answer

A) sill 
B) batholith 
C) dyke 
D) laccolith 
A) sill 
B) batholith 
C) dyke 
D) laccolith

Question 6

The mechanism of magmatic differentiation involving the removal of denser, early formed high temperature mineral phases is ________.

Accepted Answer

A) assimilation 
B) crystal settling 
C) magma mixing 
D) zone refining 
A) assimilation 
B) crystal settling 
C) magma mixing 
D) zone refining

Question 7

What phenocryst minerals would you expect to find in a porphyritic andesite?

Accepted Answer

A) intermediate (Ca-Na)plagioclase and amphibole or pyroxene 
B) Na-rich plagioclase and K-feldspar 
C) Ca-rich plagioclase and olivine 
D) muscovite and biotite 
A) intermediate (Ca-Na)plagioclase and amphibole or pyroxene 
B) Na-rich plagioclase and K-feldspar 
C) Ca-rich plagioclase and olivine 
D) muscovite and biotite

Question 8

What type of magma, commonly erupted along oceanic ridge systems, originates by partial melting of mantle peridotite?

Accepted Answer

The answer of What type of magma, commonly erupted along...

Question 9

Which igneous texture indicates two, distinctly different sizes of mineral grains?

Accepted Answer

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

Question 10

When a rock has a two-stage cooling history (slow then fast)or has minerals that crystallized at different temperatures and grew at different rates it is ________.

Accepted Answer

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

Question 11

Plutonic rocks are intrusive and generally consist of mineral grains coarse enough to be readily visible in a hand sample.

Accepted Answer

A) True 
 B)False

Question 12

All other factors being equal (geothermal gradient, pressure, composition, and heat from other sources such as friction), why is magma generally produced in association with subduction zones as opposed to areas away from subduction zones?

Accepted Answer

Water released from subducting

Question 13

A ________ is a near surface, intrusive, igneous rock body that results from local inflation of a horizontal sill.

Accepted Answer

A) batholith 
B) dike 
C) laccolith 
D) volcanic neck 
A) batholith 
B) dike 
C) laccolith 
D) volcanic neck

Question 14

Which phaneritic, igneous rock is comprised mainly of olivine, pyroxene, and calcium rich plagioclase?

Accepted Answer

A) granite 
B) rhyolite tuff 
C) gabbro 
D) basalt 
A) granite 
B) rhyolite tuff 
C) gabbro 
D) basalt

Question 15

Which of the following are used for studying rocks with a polarizing microscope?

Accepted Answer

A) polished cubes 
B) broken chips 
C) thin sections 
D) grain karats 
A) polished cubes 
B) broken chips 
C) thin sections 
D) grain karats

Question 16

A(n)________ texture would be most unlikely to occur in an extrusive igneous rock.

Accepted Answer

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

Question 17

A compositionally stratified magma chamber could give rise to a variety of volcanic products from a single volcanic centre, like at Mount Mazama.

Accepted Answer

A) True 
 B)False

Question 18

The main factors which directly govern the development of texture in all igneous rocks are ________.

Accepted Answer

A) buoyancy, crystal settling, and partial melting 
B) cooling rate, dissolved volatiles, and silica content 
C) volcano or pluton size and shape 
D) weathering and climate 
A) buoyancy, crystal settling, and partial melting 
B) cooling rate, dissolved volatiles, and silica content 
C) volcano or pluton size and shape 
D) weathering and climate

Question 19

All of the following are factors that affect the generation of magma except for ________.

Accepted Answer

A) heat 
B) pressure 
C) crystal size 
D) volatiles 
A) heat 
B) pressure 
C) crystal size 
D) volatiles

Question 20

Which of the following is the dominant feldspar in basalt?

Accepted Answer

A) plagioclase 
B) microcline 
C) orthoclase 
D) pyroxene 
A) plagioclase 
B) microcline 
C) orthoclase 
D) pyroxene

The mineral crystals in phaneritic rocks cannot be distinguished without the aid of a microscope.

98% of most common crustal igneous rocks are made of ________.

Briefly explain why the minerals that crystallize at about the same temperature in Bowen's reaction series are found together in particular igneous rocks.

Lava is just magma that has been released to or erupted onto the surface of the Earth.

Examine the words and/or phrases for each question below and determine the relationship among the majority of words/phrases. -Choose the option that does not fit the pattern.

The mechanism of magmatic differentiation involving the removal of denser, early formed high temperature mineral phases is ________.

What phenocryst minerals would you expect to find in a porphyritic andesite?

What type of magma, commonly erupted along oceanic ridge systems, originates by partial melting of mantle peridotite?

Which igneous texture indicates two, distinctly different sizes of mineral grains?

When a rock has a two-stage cooling history (slow then fast)or has minerals that crystallized at different temperatures and grew at different rates it is ________.

Plutonic rocks are intrusive and generally consist of mineral grains coarse enough to be readily visible in a hand sample.

All other factors being equal (geothermal gradient, pressure, composition, and heat from other sources such as friction), why is magma generally produced in association with subduction zones as opposed to areas away from subduction zones?

A ________ is a near surface, intrusive, igneous rock body that results from local inflation of a horizontal sill.

Which phaneritic, igneous rock is comprised mainly of olivine, pyroxene, and calcium rich plagioclase?

Which of the following are used for studying rocks with a polarizing microscope?

A(n)________ texture would be most unlikely to occur in an extrusive igneous rock.

A compositionally stratified magma chamber could give rise to a variety of volcanic products from a single volcanic centre, like at Mount Mazama.

The main factors which directly govern the development of texture in all igneous rocks are ________.

All of the following are factors that affect the generation of magma except for ________.

Which of the following is the dominant feldspar in basalt?

An Introduction to Geology and Plate Tectonics

Minerals: The Building Blocks of Rocks

Volcanoes and Volcanic Processes

Weathering and Soil

Sedimentary Rocks

Metamorphism and Metamorphic Rocks

Geologic Time

Crustal Deformation

Earthquakes and Earth's Interior

The Ocean Floor

Plate Tectonics: The Framework for Modern Geology

Mountain Building and Continental Frameworks

Mass Wasting: The Work of Gravity

Running Water

Groundwater

Glaciers and Glaciation

Deserts and Winds

Shorelines

Mineral and Energy Resources

Filters

Exam 3: Igneous Rocks

The mineral crystals in phaneritic rocks cannot be distinguished without the aid of a microscope.

98% of most common crustal igneous rocks are made of ________.

Briefly explain why the minerals that crystallize at about the same temperature in Bowen's reaction series are found together in particular igneous rocks.

Lava is just magma that has been released to or erupted onto the surface of the Earth.

Examine the words and/or phrases for each question below and determine the relationship among the majority of words/phrases. -Choose the option that does not fit the pattern.

The mechanism of magmatic differentiation involving the removal of denser, early formed high temperature mineral phases is ________.

What phenocryst minerals would you expect to find in a porphyritic andesite?

What type of magma, commonly erupted along oceanic ridge systems, originates by partial melting of mantle peridotite?

Which igneous texture indicates two, distinctly different sizes of mineral grains?

When a rock has a two-stage cooling history (slow then fast)or has minerals that crystallized at different temperatures and grew at different rates it is ________.

Plutonic rocks are intrusive and generally consist of mineral grains coarse enough to be readily visible in a hand sample.

All other factors being equal (geothermal gradient, pressure, composition, and heat from other sources such as friction), why is magma generally produced in association with subduction zones as opposed to areas away from subduction zones?

A ________ is a near surface, intrusive, igneous rock body that results from local inflation of a horizontal sill.

Which phaneritic, igneous rock is comprised mainly of olivine, pyroxene, and calcium rich plagioclase?

Which of the following are used for studying rocks with a polarizing microscope?

A(n)________ texture would be most unlikely to occur in an extrusive igneous rock.

A compositionally stratified magma chamber could give rise to a variety of volcanic products from a single volcanic centre, like at Mount Mazama.

The main factors which directly govern the development of texture in all igneous rocks are ________.

All of the following are factors that affect the generation of magma except for ________.

Which of the following is the dominant feldspar in basalt?

An Introduction to Geology and Plate Tectonics

Minerals: The Building Blocks of Rocks

Volcanoes and Volcanic Processes

Weathering and Soil

Sedimentary Rocks

Metamorphism and Metamorphic Rocks

Geologic Time

Crustal Deformation

Earthquakes and Earth's Interior

The Ocean Floor

Plate Tectonics: The Framework for Modern Geology

Mountain Building and Continental Frameworks

Mass Wasting: The Work of Gravity

Running Water

Groundwater

Glaciers and Glaciation

Deserts and Winds

Shorelines

Mineral and Energy Resources

Filters