Question 1

The correct size order of pyroclastic material (from smallest to largest) is

Accepted Answer

A)  bomb; lapilli, ash. 
B)  lapilli; ash; bomb. 
C)  bomb; ash; lapilli. 
D)  ash; lapilli; bomb. 
A)  bomb; lapilli, ash. 
B)  lapilli; ash; bomb. 
C)  bomb; ash; lapilli. 
D)  ash; lapilli; bomb.

Question 2

Why is calcite not common in the igneous rock exposed at Yosemite National park?

Accepted Answer

A)  Calcite isn't found anywhere in California. 
B)  Calcite is too strong to melt in magma, later becoming igneous rocks. 
C)  Magma is formed beneath the earth's surface which primarily contains heavier minerals like silicates, not calcite. 
D)  Calcite can only be in sedimentary rocks. 
A)  Calcite isn't found anywhere in California. 
B)  Calcite is too strong to melt in magma, later becoming igneous rocks. 
C)  Magma is formed beneath the earth's surface which primarily contains heavier minerals like silicates, not calcite. 
D)  Calcite can only be in sedimentary rocks.

Question 3

Why is silicate the most prevalent mineral in igneous rock?

Accepted Answer

A)  Silicates melt very easily. 
B)  Silicates make up most of the earth's crust. 
C)  Silicate is attracted to heat. 
D)  Silicates are very heavy, so they are perfect for magma. 
A)  Silicates melt very easily. 
B)  Silicates make up most of the earth's crust. 
C)  Silicate is attracted to heat. 
D)  Silicates are very heavy, so they are perfect for magma.

Question 4

Why are igneous rocks that consist of very small crystals called aphanitic?

Accepted Answer

A)  Aphanitic comes from the Greek word phaneros, meaning visible. 
B)  Aphanitic comes from the Greek word aphaneros, meaning invisible. 
C)  They form deep within the earth's crust. 
D)  They form deep within the earth's ocean. 
A)  Aphanitic comes from the Greek word phaneros, meaning visible. 
B)  Aphanitic comes from the Greek word aphaneros, meaning invisible. 
C)  They form deep within the earth's crust. 
D)  They form deep within the earth's ocean.

Question 5

Which is one of four processes that produces different varieties of igneous rocks?

Accepted Answer

A)  Single source rocks melt to form different types of magma. 
B)  Magma in a volcano changes mineral composition as soon as it is ejected. 
C)  Magma stays the same after assimilating nearby rocks. 
D)  Magma can change its composition by assimilating nearby rocks. 
A)  Single source rocks melt to form different types of magma. 
B)  Magma in a volcano changes mineral composition as soon as it is ejected. 
C)  Magma stays the same after assimilating nearby rocks. 
D)  Magma can change its composition by assimilating nearby rocks.

Question 6

Why should a student on a field trip in Yosemite National Park assume that a piece of rock, that when under a microscope shows tiny crystals, is basalt?

Accepted Answer

A)  Basalt forms in lava flows. 
B)  Basalt forms underground. 
C)  Basalt is green. 
D)  Basalt is always hot. 
A)  Basalt forms in lava flows. 
B)  Basalt forms underground. 
C)  Basalt is green. 
D)  Basalt is always hot.

Question 7

A large intrusion of magma that forms over a long period of time deep under the Earth has 128 square kilometers exposed to the surface by erosion. Analysis proves that the rock contains large crystals of gabbro. This formation is called

Accepted Answer

A)  a stock. 
B)  a batholith. 
C)  a dike. 
D)  a sill. 
A)  a stock. 
B)  a batholith. 
C)  a dike. 
D)  a sill.

Question 8

How does magma generation relate to Plate Tectonics? (4.6)

Accepted Answer

Magma forms only where unique circumstan

The correct size order of pyroclastic material (from smallest to largest) is

Why is calcite not common in the igneous rock exposed at Yosemite National park?

Why is silicate the most prevalent mineral in igneous rock?

Why are igneous rocks that consist of very small crystals called aphanitic?

Which is one of four processes that produces different varieties of igneous rocks?

Why should a student on a field trip in Yosemite National Park assume that a piece of rock, that when under a microscope shows tiny crystals, is basalt?

A large intrusion of magma that forms over a long period of time deep under the Earth has 128 square kilometers exposed to the surface by erosion. Analysis proves that the rock contains large crystals of gabbro. This formation is called

How does magma generation relate to Plate Tectonics? (4.6)

Why Study Earth

Minerals: Building Blocks of the Planet

Rocks and Rock-Forming Processes

Formation of Sediment and Sedimentary Rocks

Formation of Metamorphic Rocks

Earth Materials As Time Keepers

Earth Materials As Time Keepers

Making Earth

Motion Inside Earth

Deformation of Rocks

Global Tectonics: Plates and Plumes

Tectonics and Surface Relief

Soil Formation and Landscape Stability

Mass Movements: Landscapes in Motion

Streams: Flowing Water Shapes the Landscape

Water Flowing Underground

Glaciers: Cold-Climate Sculptors of Continents

Shorelines: Changing Landscapes Where Land Meets Sea

Wind: a Global Geologic Process

Global Warming: Real Time Change in the Earth System

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Exam 4: Formation of Magma and Igneous Rocks

The correct size order of pyroclastic material (from smallest to largest) is

Why is calcite not common in the igneous rock exposed at Yosemite National park?

Why is silicate the most prevalent mineral in igneous rock?

Why are igneous rocks that consist of very small crystals called aphanitic?

Which is one of four processes that produces different varieties of igneous rocks?

Why should a student on a field trip in Yosemite National Park assume that a piece of rock, that when under a microscope shows tiny crystals, is basalt?

A large intrusion of magma that forms over a long period of time deep under the Earth has 128 square kilometers exposed to the surface by erosion. Analysis proves that the rock contains large crystals of gabbro. This formation is called

How does magma generation relate to Plate Tectonics? (4.6)

Why Study Earth

Minerals: Building Blocks of the Planet

Rocks and Rock-Forming Processes

Formation of Sediment and Sedimentary Rocks

Formation of Metamorphic Rocks

Earth Materials As Time Keepers

Earth Materials As Time Keepers

Making Earth

Motion Inside Earth

Deformation of Rocks

Global Tectonics: Plates and Plumes

Tectonics and Surface Relief

Soil Formation and Landscape Stability

Mass Movements: Landscapes in Motion

Streams: Flowing Water Shapes the Landscape

Water Flowing Underground

Glaciers: Cold-Climate Sculptors of Continents

Shorelines: Changing Landscapes Where Land Meets Sea

Wind: a Global Geologic Process

Global Warming: Real Time Change in the Earth System

Filters