Question 1

The process whereby two different magmas mix is called

Accepted Answer

A) rock mixing. 
B) melt mixing. 
C) magma mixing. 
D) magma mingling. 
A) rock mixing. 
B) melt mixing. 
C) magma mixing. 
D) magma mingling.

Question 2

Which of the following igneous rocks crystallizes at Earth's surface?

Accepted Answer

A) basalt 
B) gabbro 
C) granite 
D) peridotite 
A) basalt 
B) gabbro 
C) granite 
D) peridotite

Question 3

When a large mineral surrounded by much smaller minerals in an igneous rock,the mineral in question is called a

Accepted Answer

A) porphyry. 
B) phenocryst. 
C) pumice. 
D) pyroclast. 
A) porphyry. 
B) phenocryst. 
C) pumice. 
D) pyroclast.

Question 4

Which of the following minerals is common in both felsic and mafic igneous rocks?

Accepted Answer

A) olivine 
B) plagioclase feldspar 
C) pyroxene 
D) quartz 
A) olivine 
B) plagioclase feldspar 
C) pyroxene 
D) quartz

Question 5

Bowen's Reaction Series describes

Accepted Answer

A) how fast crystals grow from cooling magmas. 
B) how fast magmas cool. 
C) how magmas react to cooling. 
D) the sequence in which minerals form when magmas cool. 
A) how fast crystals grow from cooling magmas. 
B) how fast magmas cool. 
C) how magmas react to cooling. 
D) the sequence in which minerals form when magmas cool.

Question 6

For a rock of a specific composition,which of the following statements is true?

Accepted Answer

A) The amount of partial melt decreases with increasing temperature. 
B) The melting temperature increases with increasing pressure. 
C) The melting temperature increases with increasing water content. 
D) All of the statements above are true. 
A) The amount of partial melt decreases with increasing temperature. 
B) The melting temperature increases with increasing pressure. 
C) The melting temperature increases with increasing water content. 
D) All of the statements above are true.

Question 7

Mantle plumes generate large volumes of ________ magmas.

Accepted Answer

A) andesitic 
B) peridotitic 
C) rhyolitic 
D) basaltic 
A) andesitic 
B) peridotitic 
C) rhyolitic 
D) basaltic

Question 8

The rock surrounding an intrusive igneous body is referred to as the

Accepted Answer

A) encasing rock. 
B) enclosing rock. 
C) crustal rock. 
D) country rock. 
A) encasing rock. 
B) enclosing rock. 
C) crustal rock. 
D) country rock.

Question 9

Crystal fractionation from basalt cannot by itself account for the global volume of __________ on earth.

Accepted Answer

A) andesites 
B) gabbros 
C) diorites 
D) granites 
A) andesites 
B) gabbros 
C) diorites 
D) granites

Question 10

Approximately how much volcanic rocks forms annually at subduction zones?

Accepted Answer

A) 0.1 km3 
B) 1 km3 
C) 20 km3 
D) 100 km3 
A) 0.1 km3 
B) 1 km3 
C) 20 km3 
D) 100 km3

Question 11

Which of the following types of igneous rocks crystallizes deep within Earth's crust?

Accepted Answer

A) andesite 
B) basalt 
C) gabbro 
D) rhyolite 
A) andesite 
B) basalt 
C) gabbro 
D) rhyolite

Question 12

Which igneous rock is the most abundant component of the crust and makes up nearly all of the seafloor?

Accepted Answer

A) andesite 
B) basalt 
C) granite 
D) peridotite 
A) andesite 
B) basalt 
C) granite 
D) peridotite

Question 13

Large igneous bodies that form at depth in Earth's crust are called

Accepted Answer

A) dikes. 
B) plutons. 
C) sills. 
D) veins. 
A) dikes. 
B) plutons. 
C) sills. 
D) veins.

Question 14

Which of the following best describes a rock with 10-millimeter-long plagioclase crystals set in a fine-grained matrix of 0.5-millimeter-long crystals?

Accepted Answer

A) obsidian 
B) pluton 
C) porphyry 
D) tuff 
A) obsidian 
B) pluton 
C) porphyry 
D) tuff

Question 15

Compared with the mantle beneath a mid-ocean ridge,the mantle above a subduction zone

Accepted Answer

A) contains less water and melts at a lower temperature. 
B) contains less water and melts at a higher temperature. 
C) contains more water and melts at a lower temperature. 
D) contains more water and melts at a higher temperature. 
A) contains less water and melts at a lower temperature. 
B) contains less water and melts at a higher temperature. 
C) contains more water and melts at a lower temperature. 
D) contains more water and melts at a higher temperature.

Question 16

At what temperature do minerals crystallize in hydrothermal veins?

Accepted Answer

A) approximately 300°C 
B) approximately 600°C 
C) approximately 900°C 
D) approximately 1500°C 
A) approximately 300°C 
B) approximately 600°C 
C) approximately 900°C 
D) approximately 1500°C

Question 17

Which of the following is not part of an ophiolite suite?

Accepted Answer

A) basaltic dikes 
B) granitic plutons 
C) deep-sea sediments 
D) massive gabbros 
A) basaltic dikes 
B) granitic plutons 
C) deep-sea sediments 
D) massive gabbros

The process whereby two different magmas mix is called

Which of the following igneous rocks crystallizes at Earth's surface?

When a large mineral surrounded by much smaller minerals in an igneous rock,the mineral in question is called a

Which of the following minerals is common in both felsic and mafic igneous rocks?

Bowen's Reaction Series describes

For a rock of a specific composition,which of the following statements is true?

Mantle plumes generate large volumes of ________ magmas.

The rock surrounding an intrusive igneous body is referred to as the

Crystal fractionation from basalt cannot by itself account for the global volume of __________ on earth.

Approximately how much volcanic rocks forms annually at subduction zones?

Which of the following types of igneous rocks crystallizes deep within Earth's crust?

Which igneous rock is the most abundant component of the crust and makes up nearly all of the seafloor?

Large igneous bodies that form at depth in Earth's crust are called

Which of the following best describes a rock with 10-millimeter-long plagioclase crystals set in a fine-grained matrix of 0.5-millimeter-long crystals?

Compared with the mantle beneath a mid-ocean ridge,the mantle above a subduction zone

At what temperature do minerals crystallize in hydrothermal veins?

Which of the following is not part of an ophiolite suite?

The Earth System

Plate Tectonics: The Unifying Theory

Earth Materials: Minerals and Rocks

Sedimentation: Rocks Formed by Surface Processes

Metamorphism: Alteration of Rocks by Temperature and Pressure

Deformation: Modification of Rocks by Folding and Fracturing

Clocks in Rocks: Timing the Geologic Period

Early History of the Terrestrial Planets

History of the Continents

Geobiology: Life Interacts With Earth

Volcanoes

Earthquakes

Exploring Earths Interior

The Climate System

Weathering,erosion,and Mass Wasting: Interactions Between the Climate and Plate Tectonic Systems

The Hydrologic Cycle and Groundwater

Stream Transport: From Mountains to Oceans

Winds and Deserts

Coastlines and Ocean Basins

Glaciers: the Work of Ice

Landscapes: Tectonic and Climate Interaction

The Human Impact of Earths Environment

Filters

Exam 4: Igneous Rocks: Solids From Melts

The process whereby two different magmas mix is called

Which of the following igneous rocks crystallizes at Earth's surface?

When a large mineral surrounded by much smaller minerals in an igneous rock,the mineral in question is called a

Which of the following minerals is common in both felsic and mafic igneous rocks?

Bowen's Reaction Series describes

For a rock of a specific composition,which of the following statements is true?

Mantle plumes generate large volumes of ________ magmas.

The rock surrounding an intrusive igneous body is referred to as the

Crystal fractionation from basalt cannot by itself account for the global volume of __________ on earth.

Approximately how much volcanic rocks forms annually at subduction zones?

Which of the following types of igneous rocks crystallizes deep within Earth's crust?

Which igneous rock is the most abundant component of the crust and makes up nearly all of the seafloor?

Large igneous bodies that form at depth in Earth's crust are called

Which of the following best describes a rock with 10-millimeter-long plagioclase crystals set in a fine-grained matrix of 0.5-millimeter-long crystals?

Compared with the mantle beneath a mid-ocean ridge,the mantle above a subduction zone

At what temperature do minerals crystallize in hydrothermal veins?

Which of the following is not part of an ophiolite suite?

The Earth System

Plate Tectonics: The Unifying Theory

Earth Materials: Minerals and Rocks

Sedimentation: Rocks Formed by Surface Processes

Metamorphism: Alteration of Rocks by Temperature and Pressure

Deformation: Modification of Rocks by Folding and Fracturing

Clocks in Rocks: Timing the Geologic Period

Early History of the Terrestrial Planets

History of the Continents

Geobiology: Life Interacts With Earth

Volcanoes

Earthquakes

Exploring Earths Interior

The Climate System

Weathering,erosion,and Mass Wasting: Interactions Between the Climate and Plate Tectonic Systems

The Hydrologic Cycle and Groundwater

Stream Transport: From Mountains to Oceans

Winds and Deserts

Coastlines and Ocean Basins

Glaciers: the Work of Ice

Landscapes: Tectonic and Climate Interaction

The Human Impact of Earths Environment

Filters