Geology Exam

29 Questions | By Desperatehospmgm | Updated: Mar 21, 2022 | Attempts: 1827

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1/29 Questions

The 1883 eruption of Krakatoa in Indonesia caused several large tsunami that killed thousands of people.
- True
- False

About This Quiz

Geology exam #2

2.

Earth's climate is simply too stable to be influenced by large volcanic eruptions
- True
- False
Correct Answer

A. False
3.

Once a mass of magma is created, the magma's composition cannot be changed
- True
- False
Correct Answer

A. False
4.

__________ is the dominant rock type being erupted as lava flows at the crests of Earth's oceanic ridge systems, such as in the Atlantic Ocean east of North Carolina.
- Granite
- Pegmatite
- Basalt
- Quartz
Correct Answer

A. Basalt
5.

The primary control on the style of volcanic eruption (quiet versus violent) is
- Depth to the subduction zone
- Height of the volcano
- Magma viscosity
- Magnetism
Correct Answer

A. Magma viscosity
6.

A stratovolcano
- Sunset Crater, Arizona
- Yellowstone, Wyoming
- Shiprock, New Mexico
- Mauna Loa, Hawaii
- Mt. St. Helens, Washington
Correct Answer

A. Mt. St. Helens, Washington
7.

What does the term "pyroclastic" mean?
- Any volcanic eruption of a non-silicate magma
- Unusually fluid lava flows
- High-quality obsidian used to make arrowheads and spear points
- "fire broken" materials erupted by a volcano
Correct Answer

A. "fire broken" materials erupted by a volcano
8.

What kind of volcanic material is erupted at the crest of a mid-ocean ridge?
- Pillow lavas
- Welded tuff
- Andesite lava domes
- Carbonatite hornitos
Correct Answer

A. Pillow lavas
9.

Extrusive igneous rocks are also called ___, while intrusive rocks are also called ___.
- Plutonic, volcanic
- Volcanic, plutonic
- Plutonic, granite
- Volcanic, basalt
Correct Answer

A. Volcanic, plutonic
10.

____ is the most dangerous type of volcanic activity.
- Rhyolite pyroclastic flows
- Basalt lava fountains
- Basalt pahoehoe flows
- Carbonatite hornitos
Correct Answer

A. Rhyolite pyroclastic flows
11.

_____ is the primary "driving force" behind volcanic eruptions.
- Magnetism
- Temperature
- Escaping volatiles (gasses)
- Pluto, the Greek god of the underworld
Correct Answer

A. Escaping volatiles (gasses)
12.

A ______ is a volcanic mudflow that can be a very serious volcanic hazard.
- Lahar
- Fumarole
- Caldera
- Pahoehoe
Correct Answer

A. Lahar
13.

Which of these is a common felsic igneous rock?
- Quartz
- Travertine
- Basalt
- Granite
Correct Answer

A. Granite
14.

Mt. St. Helens is a dormant volcano, which means that it
- Will not erupt again
- Is now classified as a sedimentary rock deposit
- Can only erupt pyroclastic flows approximately once per million years
- Will erupt again in the future
Correct Answer

A. Will erupt again in the future
15.

Most magma generated on earth
- Stays below the surface and forms intrusions
- Sings to the core-mantle boundary because of it's magnetism
- Erupts at the surface and forms volcanic rocks
Correct Answer

A. Stays below the surface and forms intrusions
16.

What is a fundamental difference in chemical compostion between the igneous rocks granite and basalt?
- There is no difference
- One rock contains abundant silicon and one rock contains none
- One contains abundadant ferromagnesian minerals and the other has almost none
Correct Answer

A. One contains abundadant ferromagnesian minerals and the other has almost none
17.

The largest masses of igneous intrusive rocks (plutons) exposed at Earth's surface are _________ composed of granite
- Sills
- Dikes
- Laccoliths
- Batholiths
Correct Answer

A. Batholiths
18.

Cinder cones are
- Relatively small steep sided volcanoes
- Typically composed of basalt
- Built from ash, cinders, and other pyroclastic materials
- All of the above
- Only A and B
Correct Answer

A. All of the above
19.

A cinder cone
- Sunset Crater, Arizona
- Yellowstone, Wyoming
- Shiprock, New Mexico
- Mauna Loa, Hawaii
- Mt. St. Helens, Washington
Correct Answer

A. Sunset Crater, Arizona
20.

How can hot rocks of Earth's mantle be caused to melt and create basaltic magma?
- They can't- it is impossible to melt mantle rocks
- Reduce the concentration of water and other volatiles
- Reduce the confining pressure on the hot rocks
- Reduce the temperature of the rocks
Correct Answer

A. Reduce the confining pressure on the hot rocks
21.

A shield volcano
- Sunset Crater, Arizona
- Yellowstone, Wyoming
- Shiprock, New Mexico
- Mauna Loa, Hawaii
- Mt. St. Helens, Washington
Correct Answer

A. Mauna Loa, Hawaii
22.

A very large caldera
- Sunset Crater, Arizona
- Yellowstone, Wyoming
- Shiprock, New Mexico
- Mauna Loa, Hawaii
- Mt. St. Helens, Washington
Correct Answer

A. Yellowstone, Wyoming
23.

Gasses (volatiles) escaping from magma will produce vesicles (voids or bubbles) in the solified rock. Which of these is not an example of vesicular texture?
- Scoria basalt
- Rhyolite
- Granite pegmatite
Correct Answer

A. Granite pegmatite
24.

A ______ typically results from a major eruption of hundreds of cubic miles of hot ash.
- Shield volcano
- Cinder cone
- Caldera
Correct Answer

A. Caldera
25.

A dike is a type of igneous pluton that is _______ relative to the structure or layering of the older rocks that were intruded by the dike.
- Convergent
- Divergent
- Concordant
- Discordant
Correct Answer

A. Discordant
26.

Much of the ______ Ocean basin is rimmed by active subduction zones, therefore it has most of Earth's ______ located around it's margins.
- Pacific, shield volcanoes
- Atlantic, shield volcanoes
- Pacific, composite cones
- Atlantic, composite cones
Correct Answer

A. Pacific, composite cones
27.

Which type of basalt lava flow is shown on the right side of the front projection screen?
- Aa
- Pahoehoe
- Welded tuff
- Quartz
Correct Answer

A. Aa
28.

A sample of Hawaiian basalt is shown on the left side of the front projection screen. Which of the following igneous textures is not displayed by this rock?
- Vesicular (or scoria)
- Phaneritic
- Aphanitic
- Porphyritic
Correct Answer

A. Phaneritic
29.

The igneous plumbing of an extinct volcano
- Sunset Crater, Arizona
- Yellowstone, Wyoming
- Shiprock, New Mexico
- Mauna Loa, Hawaii
- Mt. St. Helens, Washington
Correct Answer

A. Shiprock, New Mexico

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Current Version
Mar 21, 2022

Quiz Edited by
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Dec 08, 2008

Quiz Created by
Desperatehospmgm

Geology Exam

The 1883 eruption of Krakatoa in Indonesia caused several large tsunami that killed thousands of people.

Quiz Preview

Earth's climate is simply too stable to be influenced by large volcanic eruptions

Once a mass of magma is created, the magma's composition cannot be changed

__________ is the dominant rock type being erupted as lava flows at the crests of Earth's oceanic ridge systems, such as in the Atlantic Ocean east of North Carolina.

The primary control on the style of volcanic eruption (quiet versus violent) is

A stratovolcano

What does the term "pyroclastic" mean?

What kind of volcanic material is erupted at the crest of a mid-ocean ridge?

Extrusive igneous rocks are also called _, while intrusive rocks are also called _.

____ is the most dangerous type of volcanic activity.

_____ is the primary "driving force" behind volcanic eruptions.

A ______ is a volcanic mudflow that can be a very serious volcanic hazard.

Which of these is a common felsic igneous rock?

Mt. St. Helens is a dormant volcano, which means that it

Most magma generated on earth

What is a fundamental difference in chemical compostion between the igneous rocks granite and basalt?

The largest masses of igneous intrusive rocks (plutons) exposed at Earth's surface are _________ composed of granite

Cinder cones are

A cinder cone

How can hot rocks of Earth's mantle be caused to melt and create basaltic magma?

A shield volcano

A very large caldera

Gasses (volatiles) escaping from magma will produce vesicles (voids or bubbles) in the solified rock. Which of these is not an example of vesicular texture?

A ______ typically results from a major eruption of hundreds of cubic miles of hot ash.

A dike is a type of igneous pluton that is _______ relative to the structure or layering of the older rocks that were intruded by the dike.

Much of the Ocean basin is rimmed by active subduction zones, therefore it has most of Earth's located around it's margins.

Which type of basalt lava flow is shown on the right side of the front projection screen?

A sample of Hawaiian basalt is shown on the left side of the front projection screen. Which of the following igneous textures is not displayed by this rock?

The igneous plumbing of an extinct volcano

Geology Exam

The 1883 eruption of Krakatoa in Indonesia caused several large tsunami that killed thousands of people.

Quiz Preview

Earth's climate is simply too stable to be influenced by large volcanic eruptions

Once a mass of magma is created, the magma's composition cannot be changed

__________ is the dominant rock type being erupted as lava flows at the crests of Earth's oceanic ridge systems, such as in the Atlantic Ocean east of North Carolina.

The primary control on the style of volcanic eruption (quiet versus violent) is

A stratovolcano

What does the term "pyroclastic" mean?

What kind of volcanic material is erupted at the crest of a mid-ocean ridge?

Extrusive igneous rocks are also called ___, while intrusive rocks are also called ___.

____ is the most dangerous type of volcanic activity.

_____ is the primary "driving force" behind volcanic eruptions.

A ______ is a volcanic mudflow that can be a very serious volcanic hazard.

Which of these is a common felsic igneous rock?

Mt. St. Helens is a dormant volcano, which means that it

Most magma generated on earth

What is a fundamental difference in chemical compostion between the igneous rocks granite and basalt?

The largest masses of igneous intrusive rocks (plutons) exposed at Earth's surface are _________ composed of granite

Cinder cones are

A cinder cone

How can hot rocks of Earth's mantle be caused to melt and create basaltic magma?

A shield volcano

A very large caldera

Gasses (volatiles) escaping from magma will produce vesicles (voids or bubbles) in the solified rock. Which of these is not an example of vesicular texture?

A ______ typically results from a major eruption of hundreds of cubic miles of hot ash.

A dike is a type of igneous pluton that is _______ relative to the structure or layering of the older rocks that were intruded by the dike.

Much of the ______ Ocean basin is rimmed by active subduction zones, therefore it has most of Earth's ______ located around it's margins.

Which type of basalt lava flow is shown on the right side of the front projection screen?

A sample of Hawaiian basalt is shown on the left side of the front projection screen. Which of the following igneous textures is not displayed by this rock?

The igneous plumbing of an extinct volcano

Extrusive igneous rocks are also called _, while intrusive rocks are also called _.

Much of the Ocean basin is rimmed by active subduction zones, therefore it has most of Earth's located around it's margins.