Geology Exam

29 Questions | By Desperatehospmgm | Updated: Mar 21, 2022 | Attempts: 1826

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Questions and Answers

1.

Once a mass of magma is created, the magma's composition cannot be changed
- A.
  
  True
- B.
  
  False
Correct Answer
B. False
2.

Extrusive igneous rocks are also called ___, while intrusive rocks are also called ___.
- A.
  
  Plutonic, volcanic
- B.
  
  Volcanic, plutonic
- C.
  
  Plutonic, granite
- D.
  
  Volcanic, basalt
Correct Answer
B. Volcanic, plutonic
3.

What is a fundamental difference in chemical compostion between the igneous rocks granite and basalt?
- A.
  
  There is no difference
- B.
  
  One rock contains abundant silicon and one rock contains none
- C.
  
  One contains abundadant ferromagnesian minerals and the other has almost none
Correct Answer
C. One contains abundadant ferromagnesian minerals and the other has almost none
4.

Which of these is a common felsic igneous rock?
- A.
  
  Quartz
- B.
  
  Travertine
- C.
  
  Basalt
- D.
  
  Granite
Correct Answer
D. Granite
5.

__________ 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.
- A.
  
  Granite
- B.
  
  Pegmatite
- C.
  
  Basalt
- D.
  
  Quartz
Correct Answer
C. Basalt
6.

Most magma generated on earth
- A.
  
  Stays below the surface and forms intrusions
- B.
  
  Sings to the core-mantle boundary because of it's magnetism
- C.
  
  Erupts at the surface and forms volcanic rocks
Correct Answer
A. Stays below the surface and forms intrusions
7.

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.
  
  Scoria basalt
- B.
  
  Rhyolite
- C.
  
  Granite pegmatite
Correct Answer
C. Granite pegmatite
8.

What does the term "pyroclastic" mean?
- A.
  
  Any volcanic eruption of a non-silicate magma
- B.
  
  Unusually fluid lava flows
- C.
  
  High-quality obsidian used to make arrowheads and spear points
- D.
  
  "fire broken" materials erupted by a volcano
Correct Answer
D. "fire broken" materials erupted by a volcano
9.

_____ is the primary "driving force" behind volcanic eruptions.
- A.
  
  Magnetism
- B.
  
  Temperature
- C.
  
  Escaping volatiles (gasses)
- D.
  
  Pluto, the Greek god of the underworld
Correct Answer
C. Escaping volatiles (gasses)
10.

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?
- A.
  
  Vesicular (or scoria)
- B.
  
  Phaneritic
- C.
  
  Aphanitic
- D.
  
  Porphyritic
Correct Answer
B. Phaneritic
11.

The primary control on the style of volcanic eruption (quiet versus violent) is
- A.
  
  Depth to the subduction zone
- B.
  
  Height of the volcano
- C.
  
  Magma viscosity
- D.
  
  Magnetism
Correct Answer
C. Magma viscosity
12.

Cinder cones are
- A.
  
  Relatively small steep sided volcanoes
- B.
  
  Typically composed of basalt
- C.
  
  Built from ash, cinders, and other pyroclastic materials
- D.
  
  All of the above
- E.
  
  Only A and B
Correct Answer
D. All of the above
13.

What kind of volcanic material is erupted at the crest of a mid-ocean ridge?
- A.
  
  Pillow lavas
- B.
  
  Welded tuff
- C.
  
  Andesite lava domes
- D.
  
  Carbonatite hornitos
Correct Answer
A. Pillow lavas
14.

____ is the most dangerous type of volcanic activity.
- A.
  
  Rhyolite pyroclastic flows
- B.
  
  Basalt lava fountains
- C.
  
  Basalt pahoehoe flows
- D.
  
  Carbonatite hornitos
Correct Answer
A. Rhyolite pyroclastic flows
15.

Which type of basalt lava flow is shown on the right side of the front projection screen?
- A.
  
  Aa
- B.
  
  Pahoehoe
- C.
  
  Welded tuff
- D.
  
  Quartz
Correct Answer
A. Aa
16.

A shield volcano
- A.
  
  Sunset Crater, Arizona
- B.
  
  Yellowstone, Wyoming
- C.
  
  Shiprock, New Mexico
- D.
  
  Mauna Loa, Hawaii
- E.
  
  Mt. St. Helens, Washington
Correct Answer
D. Mauna Loa, Hawaii
17.

The igneous plumbing of an extinct volcano
- A.
  
  Sunset Crater, Arizona
- B.
  
  Yellowstone, Wyoming
- C.
  
  Shiprock, New Mexico
- D.
  
  Mauna Loa, Hawaii
- E.
  
  Mt. St. Helens, Washington
Correct Answer
C. Shiprock, New Mexico
18.

A very large caldera
- A.
  
  Sunset Crater, Arizona
- B.
  
  Yellowstone, Wyoming
- C.
  
  Shiprock, New Mexico
- D.
  
  Mauna Loa, Hawaii
- E.
  
  Mt. St. Helens, Washington
Correct Answer
B. Yellowstone, Wyoming
19.

A cinder cone
- A.
  
  Sunset Crater, Arizona
- B.
  
  Yellowstone, Wyoming
- C.
  
  Shiprock, New Mexico
- D.
  
  Mauna Loa, Hawaii
- E.
  
  Mt. St. Helens, Washington
Correct Answer
A. Sunset Crater, Arizona
20.

A stratovolcano
- A.
  
  Sunset Crater, Arizona
- B.
  
  Yellowstone, Wyoming
- C.
  
  Shiprock, New Mexico
- D.
  
  Mauna Loa, Hawaii
- E.
  
  Mt. St. Helens, Washington
Correct Answer
E. Mt. St. Helens, Washington
21.

Mt. St. Helens is a dormant volcano, which means that it
- A.
  
  Will not erupt again
- B.
  
  Is now classified as a sedimentary rock deposit
- C.
  
  Can only erupt pyroclastic flows approximately once per million years
- D.
  
  Will erupt again in the future
Correct Answer
D. Will erupt again in the future
22.

A ______ typically results from a major eruption of hundreds of cubic miles of hot ash.
- A.
  
  Shield volcano
- B.
  
  Cinder cone
- C.
  
  Caldera
Correct Answer
C. Caldera
23.

A ______ is a volcanic mudflow that can be a very serious volcanic hazard.
- A.
  
  Lahar
- B.
  
  Fumarole
- C.
  
  Caldera
- D.
  
  Pahoehoe
Correct Answer
A. Lahar
24.

The 1883 eruption of Krakatoa in Indonesia caused several large tsunami that killed thousands of people.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True
25.

Earth's climate is simply too stable to be influenced by large volcanic eruptions
- A.
  
  True
- B.
  
  False
Correct Answer
B. False
26.

The largest masses of igneous intrusive rocks (plutons) exposed at Earth's surface are _________ composed of granite
- A.
  
  Sills
- B.
  
  Dikes
- C.
  
  Laccoliths
- D.
  
  Batholiths
Correct Answer
D. Batholiths
27.

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.
- A.
  
  Convergent
- B.
  
  Divergent
- C.
  
  Concordant
- D.
  
  Discordant
Correct Answer
D. Discordant
28.

How can hot rocks of Earth's mantle be caused to melt and create basaltic magma?
- A.
  
  They can't- it is impossible to melt mantle rocks
- B.
  
  Reduce the concentration of water and other volatiles
- C.
  
  Reduce the confining pressure on the hot rocks
- D.
  
  Reduce the temperature of the rocks
Correct Answer
C. Reduce the confining pressure on the hot rocks
29.

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

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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

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

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

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

Which of these is a common felsic igneous rock?

__________ 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.

Most magma generated on earth

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?

What does the term "pyroclastic" mean?

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

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

Cinder cones are

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

____ is the most dangerous type of volcanic activity.

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

A shield volcano

The igneous plumbing of an extinct volcano

A very large caldera

A cinder cone

A stratovolcano

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

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

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

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

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

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

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.

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

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

Geology Exam

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

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

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

Which of these is a common felsic igneous rock?

__________ 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.

Most magma generated on earth

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?

What does the term "pyroclastic" mean?

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

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

Cinder cones are

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

____ is the most dangerous type of volcanic activity.

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

A shield volcano

The igneous plumbing of an extinct volcano

A very large caldera

A cinder cone

A stratovolcano

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

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

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

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

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

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

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.

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

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

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.