Question 1

Thousands of people have been killed by pyroclastic flows erupted from cinder cones.

Accepted Answer

A) True 
 B)False

Question 2

In 1980,________ was the first Cascade Range volcano to erupt since Mt.Lassen in 1915-16.

Accepted Answer

A) Mt.Rainier 
B) Mt.Shasta 
C) Kilauea 
D) Mt.St.Helens 
A) Mt.Rainier 
B) Mt.Shasta 
C) Kilauea 
D) Mt.St.Helens

Question 3

A rock outcrop exposes a layer of obsidian overlain by volcanic ash and a layer with fragments of lapilli.What rock composition and eruptive type fits this description?

Accepted Answer

A) basalt erupted from a cinder cone 
B) basalt flows and interbedded andesite deposited on a shield volcano 
C) andesite and basalt erupted from a stratovolcano 
D) rhyolite erupted in violent pyroclastic eruptions 
A) basalt erupted from a cinder cone 
B) basalt flows and interbedded andesite deposited on a shield volcano 
C) andesite and basalt erupted from a stratovolcano 
D) rhyolite erupted in violent pyroclastic eruptions

Question 4

Which type of basaltic lava flow has its surface covered with sharp-edged,angular blocks and rubble?

Accepted Answer

A) scoria 
B) pahoehoe 
C) pillow lava 
D) aa 
A) scoria 
B) pahoehoe 
C) pillow lava 
D) aa

Question 5

Mt.St.Helens in the U.S.and Mt.Fujiyama in Japan are examples of ________.

Accepted Answer

A) cinder cones 
B) shield volcanos 
C) composite volcanos 
D) calderas 
A) cinder cones 
B) shield volcanos 
C) composite volcanos 
D) calderas

Question 6

Match the letter on the figure with the term.  
-Vent

Accepted Answer

The answer of Match the letter on the figure with...

Question 7

The Columbia Plateau in the northwestern United States is an excellent example of ________.

Accepted Answer

A) silica-rich lava flows 
B) pyroclastic flow deposits 
C) flood basalts 
D) an eroded shield volcano 
A) silica-rich lava flows 
B) pyroclastic flow deposits 
C) flood basalts 
D) an eroded shield volcano

Question 8

The main mechanism for melting at spreading ridges is decompression melting of ultramafic mantle rock.

Accepted Answer

A) True 
 B)False

Question 9

Kilauea is an example of a ________.

Accepted Answer

A) shield volcano 
B) cinder cone 
C) lava dome 
D) volcanic neck 
A) shield volcano 
B) cinder cone 
C) lava dome 
D) volcanic neck

Question 10

Match the letter on the figure with the term.  
-Lava flow

Accepted Answer

The answer of Match the letter on the figure with...

Question 11

Match the name of the tectonic feature with the Figure.  
-convergent plate margin

Accepted Answer

The answer of Match the name of the tectonic feature...

Question 12

Which of the following best describes the bedrock in the Sierra Nevada Mountains in California?

Accepted Answer

A) basalt; dikes 
B) gabbro; plutoliths 
C) andesite; laccoliths 
D) granite; batholiths 
A) basalt; dikes 
B) gabbro; plutoliths 
C) andesite; laccoliths 
D) granite; batholiths

Question 13

Calderas range in size from less than 1km to tens of kilometers across.What do they all have in common?

Accepted Answer

A) They all form by subsidence of the caldera center due to withdrawal of magma from below. 
B) They all form in explosive eruptions. 
C) They all are formed in rhyolitic volcanos and have associated eruptions of ash flow tuff. 
D) They all form from collapse of composite volcanos following explosive eruptions; Crater lake is an example. 
A) They all form by subsidence of the caldera center due to withdrawal of magma from below. 
B) They all form in explosive eruptions. 
C) They all are formed in rhyolitic volcanos and have associated eruptions of ash flow tuff. 
D) They all form from collapse of composite volcanos following explosive eruptions; Crater lake is an example.

Question 14

A geologist is working in an area of old volcanic rocks exposed by erosion.He finds a large rock outcrop that contains flat lying gravels in the base of the outcrop.These gravels are overlain by basalt that forms a series of layers representing flows.The uppermost basalt lava flows have a dip of about 10 degrees to the west.What does this outcrop record?

Accepted Answer

A) Basalt flows formed above a series of gravels,filling a river valley. 
B) Basalt flows formed after gravels were deposited,covered the local terrain,and built a shield volcano with dips of about 10 degrees. 
C) Gravels were initially deposited in a river valley and a cinder cone was erupted,damming the valley,before a cinder cone formed. 
D) You can't tell anything about the history of this region from this outcrop. 
A) Basalt flows formed above a series of gravels,filling a river valley. 
B) Basalt flows formed after gravels were deposited,covered the local terrain,and built a shield volcano with dips of about 10 degrees. 
C) Gravels were initially deposited in a river valley and a cinder cone was erupted,damming the valley,before a cinder cone formed. 
D) You can't tell anything about the history of this region from this outcrop.

Question 15

A basaltic volcano is likely to produce an explosive column that would endanger flying aircraft.

Accepted Answer

A) True 
 B)False

Question 16

A volcanic deposit comprised of red to black lapilli-sized pyroclastic material associated with pahoehoe lava flows was probably deposited on ________.

Accepted Answer

A) a large composite volcano 
B) a shield volcano 
C) a cinder cone 
D) a satellite shield volcano on a rhyolitic caldera 
A) a large composite volcano 
B) a shield volcano 
C) a cinder cone 
D) a satellite shield volcano on a rhyolitic caldera

Question 17

Which one of the following statements concerning cinder cones is false?

Accepted Answer

A) They are small volcanoes with fairly steep sides. 
B) They are built mostly or entirely during one eruptive cycle. 
C) The cinders and other pyroclastic particles are consolidated into welded tuff. 
D) The cinders most commonly are basaltic. 
A) They are small volcanoes with fairly steep sides. 
B) They are built mostly or entirely during one eruptive cycle. 
C) The cinders and other pyroclastic particles are consolidated into welded tuff. 
D) The cinders most commonly are basaltic.

Question 18

________ are usually the most abundant gases emitted during basaltic volcanism.

Accepted Answer

A) Chlorine and sodium 
B) Neon and ammonia 
C) Oxygen and nitrogen 
D) Water and carbon dioxide 
A) Chlorine and sodium 
B) Neon and ammonia 
C) Oxygen and nitrogen 
D) Water and carbon dioxide

Question 19

large,fairly steep-sided cones composed of lavas and pyroclastic layers

Accepted Answer

composite/

Question 20

Powerful,explosive,volcanic eruptions can result in climatic cooling for millions of years following the eruption.

Accepted Answer

A) True 
 B)False

Exam 9: Volcanoes and Other Igneous Activity

Thousands of people have been killed by pyroclastic flows erupted from cinder cones.

In 1980,________ was the first Cascade Range volcano to erupt since Mt.Lassen in 1915-16.

A rock outcrop exposes a layer of obsidian overlain by volcanic ash and a layer with fragments of lapilli.What rock composition and eruptive type fits this description?

Which type of basaltic lava flow has its surface covered with sharp-edged,angular blocks and rubble?

Mt.St.Helens in the U.S.and Mt.Fujiyama in Japan are examples of ________.

Match the letter on the figure with the term. -Vent

The Columbia Plateau in the northwestern United States is an excellent example of ________.

The main mechanism for melting at spreading ridges is decompression melting of ultramafic mantle rock.

Kilauea is an example of a ________.

Match the letter on the figure with the term. -Lava flow

Match the name of the tectonic feature with the Figure. -convergent plate margin

Which of the following best describes the bedrock in the Sierra Nevada Mountains in California?

Calderas range in size from less than 1km to tens of kilometers across.What do they all have in common?

A basaltic volcano is likely to produce an explosive column that would endanger flying aircraft.

A volcanic deposit comprised of red to black lapilli-sized pyroclastic material associated with pahoehoe lava flows was probably deposited on ________.

Which one of the following statements concerning cinder cones is false?

________ are usually the most abundant gases emitted during basaltic volcanism.

large,fairly steep-sided cones composed of lavas and pyroclastic layers

Powerful,explosive,volcanic eruptions can result in climatic cooling for millions of years following the eruption.

Introduction to Earth Science

Matter and Minerals

Rocks: Materials of the Solid Earth

Weathering, soil, and Mass Wasting

Running Water and Groundwater

Glaciers, deserts, and Wind

Plate Tectonics: a Scientific Revolution Unfolds

Earthquakes and Earths Interior

Crustal Deformation and Mountain Building

Geologic Time

Earths Evolution Through Geologic Time

The Ocean Floor

Ocean Water and Ocean Life

The Dynamic Ocean

The Atmosphere: Composition,structure,and Temperature

Moisture, clouds, and Precipitation

Air Pressure and Wind

Weather Patterns and Severe Weather

World Climates and Global Climate Change

Origin of Modern Astronomy

Touring Our Solar System

Light,astronomical Observations,and the Sun

Beyond Our Solar System

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