Question 1

Which of the statements regarding economically valuable igneous rocks or minerals is NOT true?

Accepted Answer

A)  The fact that they crystallize at lower temperatures than most other minerals accounts for economically valuable concentrations of some minerals. 
B)  Solution and hot fluid redeposition form economically valuable concentrations of some minerals. 
C)  Valuable stones, such as emerald and topaz, are found in felsic pegmatitic rock. 
D)  Gold, silver, copper, lead, and zinc often form near mafic and ultramafic igneous rocks. 
A)  The fact that they crystallize at lower temperatures than most other minerals accounts for economically valuable concentrations of some minerals. 
B)  Solution and hot fluid redeposition form economically valuable concentrations of some minerals. 
C)  Valuable stones, such as emerald and topaz, are found in felsic pegmatitic rock. 
D)  Gold, silver, copper, lead, and zinc often form near mafic and ultramafic igneous rocks.

Question 2

At the Battle of Gettysburg:

Accepted Answer

A)  both were sills. 
B)  Seminary Ridge was a sill, Cemetary Ridge was a dike. 
C)  Seminary Ridge was a dike, Cemetary Ridge was a sill. 
D)  both were dikes. 
A)  both were sills. 
B)  Seminary Ridge was a sill, Cemetary Ridge was a dike. 
C)  Seminary Ridge was a dike, Cemetary Ridge was a sill. 
D)  both were dikes.

Question 3

All of the following processes contribute felsic material to rising basaltic magmas EXCEPT:

Accepted Answer

A)  melting of accumulated biogenic silica from marine microorganisms. 
B)  subduction zone magmas assimilate overlying crustal rocks. 
C)  melting of accumulated detrital continental sediments. 
D)  partial melting of the warm mantle above a subducting oceanic slab. 
A)  melting of accumulated biogenic silica from marine microorganisms. 
B)  subduction zone magmas assimilate overlying crustal rocks. 
C)  melting of accumulated detrital continental sediments. 
D)  partial melting of the warm mantle above a subducting oceanic slab.

Question 4

Under which of the following conditions would rocks melt at a lower temperature?

Accepted Answer

A)  Low water content, low pressure. 
B)  High water content, low pressure. 
C)  High water content, high pressure. 
D)  Low water content, high pressure. 
A)  Low water content, low pressure. 
B)  High water content, low pressure. 
C)  High water content, high pressure. 
D)  Low water content, high pressure.

Question 5

Which of the following rocks probably underwent the slowest cooling rate?

Accepted Answer

A)  Obsidian. 
B)  Pumice. 
C)  Gabbro. 
D)  Basalt. 
A)  Obsidian. 
B)  Pumice. 
C)  Gabbro. 
D)  Basalt.

Question 6

Which of the following statements about the creation of magma is true?

Accepted Answer

A)  Increasing pressure raises the melting point except in the presence of water. 
B)  Increasing pressure raises the melting point regardless of the water content. 
C)  Increasing pressure lowers the melting point except in the presence of water. 
D)  Increasing pressure raises the melting point except in the absence of water. 
A)  Increasing pressure raises the melting point except in the presence of water. 
B)  Increasing pressure raises the melting point regardless of the water content. 
C)  Increasing pressure lowers the melting point except in the presence of water. 
D)  Increasing pressure raises the melting point except in the absence of water.

Question 7

Fluid magma rises for all of the following reasons EXCEPT:

Accepted Answer

A)  surrounding rocks press on the magma and squeeze it upward. 
B)  it is less dense than the solid rock that surrounds it. 
C)  gases in the magma expand outward, driving the magma upward. 
D)  the Earth's magnetic field acts on the iron component of the magma. 
A)  surrounding rocks press on the magma and squeeze it upward. 
B)  it is less dense than the solid rock that surrounds it. 
C)  gases in the magma expand outward, driving the magma upward. 
D)  the Earth's magnetic field acts on the iron component of the magma.

Question 8

Most igneous rocks are composed primarily of:

Accepted Answer

A)  oxygen and hydrogen. 
B)  oxygen and silicon. 
C)  iron and aluminum. 
D)  iron and magnesium. 
A)  oxygen and hydrogen. 
B)  oxygen and silicon. 
C)  iron and aluminum. 
D)  iron and magnesium.

Question 9

A sill is a:

Accepted Answer

A)  a discordant tabular pluton. 
B)  a concordant tabular pluton. 
C)  a massive discordant pluton. 
D)  a massive concordant pluton. 
A)  a discordant tabular pluton. 
B)  a concordant tabular pluton. 
C)  a massive discordant pluton. 
D)  a massive concordant pluton.

Question 10

What features on Earth are indirectly the result of the melting of rocks?

Accepted Answer

A)  Eroded mountains. 
B)  The oceans and atmosphere. 
C)  Landslides. 
D)  Earthquakes. 
A)  Eroded mountains. 
B)  The oceans and atmosphere. 
C)  Landslides. 
D)  Earthquakes.

Question 11

What is the process by which a single parent magma can produce a variety of rocks of different composition?

Accepted Answer

A)  Assimilation. 
B)  Fractional crystallization. 
C)  Subduction. 
D)  Magma mixing. 
A)  Assimilation. 
B)  Fractional crystallization. 
C)  Subduction. 
D)  Magma mixing.

Question 12

A domed intrusion of igneous rock produced by rising magma is termed a:

Accepted Answer

A)  country rock. 
B)  xenolith. 
C)  diapir. 
D)  dike. 
A)  country rock. 
B)  xenolith. 
C)  diapir. 
D)  dike.

Question 13

The primary difference between magma and lava is that:

Accepted Answer

A)  they are produced from different parent materials. 
B)  magma becomes lava anytime it is in a cooling condition. 
C)  one occurs at divergent plate boundaries, the other at convergent plate boundaries. 
D)  one is below the ground, the other is above the ground. 
A)  they are produced from different parent materials. 
B)  magma becomes lava anytime it is in a cooling condition. 
C)  one occurs at divergent plate boundaries, the other at convergent plate boundaries. 
D)  one is below the ground, the other is above the ground.

Question 14

The existence of both intrusive and extrusive igneous rocks demonstrates that magma rises. Describe four reasons why magma rises.

Accepted Answer

Magma rises because it is less dense tha

Question 15

A dike is a:

Accepted Answer

A)  a discordant tabular pluton. 
B)  a discordant non- igneous body. 
C)  a massive discordant pluton. 
D)  a concordant tabular pluton. 
A)  a discordant tabular pluton. 
B)  a discordant non- igneous body. 
C)  a massive discordant pluton. 
D)  a concordant tabular pluton.

Question 16

Viscosity of a magma:

Accepted Answer

A)  decreases with increasing temperature. 
B)  increases with decreasing temperature and high silica content. 
C)  increases with increasing temperature and low silica content. 
D)  decreases with increasing silica content. 
A)  decreases with increasing temperature. 
B)  increases with decreasing temperature and high silica content. 
C)  increases with increasing temperature and low silica content. 
D)  decreases with increasing silica content.

Question 17

What is the origin of the two types of igneous rocks found on the Moon?

Accepted Answer

The highlands are composed primarily of

Which of the statements regarding economically valuable igneous rocks or minerals is NOT true?

At the Battle of Gettysburg:

All of the following processes contribute felsic material to rising basaltic magmas EXCEPT:

Under which of the following conditions would rocks melt at a lower temperature?

Which of the following rocks probably underwent the slowest cooling rate?

Which of the following statements about the creation of magma is true?

Fluid magma rises for all of the following reasons EXCEPT:

Most igneous rocks are composed primarily of:

A sill is a:

What features on Earth are indirectly the result of the melting of rocks?

What is the process by which a single parent magma can produce a variety of rocks of different composition?

A domed intrusion of igneous rock produced by rising magma is termed a:

The primary difference between magma and lava is that:

The existence of both intrusive and extrusive igneous rocks demonstrates that magma rises. Describe four reasons why magma rises.

A dike is a:

Viscosity of a magma:

What is the origin of the two types of igneous rocks found on the Moon?

A First Look at Planet Earth - Its Origins, Systems, and Tectonic Plates

Minerals

Volcanoes and Volcanism

Weathering - the Breakdown of Rocks

Sedimentary Processes, Environments, and Rocks

Metamorphism and Metamorphic Rocks

Telling Time Geologically

Earth Structures - Folds, Faults, and Fabrics

Earthquakes

The Earths Interior - Whats Going on Down There

Plate Tectonics and the Formation of the Earths Oceans

Continental Tectonics and the Formation of the Earths Continents

Mass Movement

Streams and Floods

Groundwater

Glaciers and Ice Ages

Deserts and the Work of Winds

Shores and Coastal Processes

Human Use of the Earths Resources Appendices Glossary

Filters

Exam 3: Igneous Rocks and Processes

Which of the statements regarding economically valuable igneous rocks or minerals is NOT true?

At the Battle of Gettysburg:

All of the following processes contribute felsic material to rising basaltic magmas EXCEPT:

Under which of the following conditions would rocks melt at a lower temperature?

Which of the following rocks probably underwent the slowest cooling rate?

Which of the following statements about the creation of magma is true?

Fluid magma rises for all of the following reasons EXCEPT:

Most igneous rocks are composed primarily of:

A sill is a:

What features on Earth are indirectly the result of the melting of rocks?

What is the process by which a single parent magma can produce a variety of rocks of different composition?

A domed intrusion of igneous rock produced by rising magma is termed a:

The primary difference between magma and lava is that:

The existence of both intrusive and extrusive igneous rocks demonstrates that magma rises. Describe four reasons why magma rises.

A dike is a:

Viscosity of a magma:

What is the origin of the two types of igneous rocks found on the Moon?

A First Look at Planet Earth - Its Origins, Systems, and Tectonic Plates

Minerals

Volcanoes and Volcanism

Weathering - the Breakdown of Rocks

Sedimentary Processes, Environments, and Rocks

Metamorphism and Metamorphic Rocks

Telling Time Geologically

Earth Structures - Folds, Faults, and Fabrics

Earthquakes

The Earths Interior - Whats Going on Down There

Plate Tectonics and the Formation of the Earths Oceans

Continental Tectonics and the Formation of the Earths Continents

Mass Movement

Streams and Floods

Groundwater

Glaciers and Ice Ages

Deserts and the Work of Winds

Shores and Coastal Processes

Human Use of the Earths Resources Appendices Glossary

Filters