Question 1

Pillow lavas are ________.

Accepted Answer

A) basaltic magmas erupted on the seafloor as magma blobs from an explosive,submarine eruption 
B) basaltic lava tubes erupted on the seafloor in volcanic piles analogous to toothpaste extruded from a tube 
C) andesitic bombs erupted from a cinder cone that accumulate as pillow-like masses around the cone 
D) rhyolite glasses that develop a banding that resembles a pillow case with internal snowflake obsidian that looks like feathers 
A) basaltic magmas erupted on the seafloor as magma blobs from an explosive,submarine eruption 
B) basaltic lava tubes erupted on the seafloor in volcanic piles analogous to toothpaste extruded from a tube 
C) andesitic bombs erupted from a cinder cone that accumulate as pillow-like masses around the cone 
D) rhyolite glasses that develop a banding that resembles a pillow case with internal snowflake obsidian that looks like feathers

Question 2

pahoehoe aa volcanic bomb pillow lava

Accepted Answer

The answer of pahoehoe aa volcanic bomb pillow lava...

Question 3

Which of the following best describes Shiprock,a famous volcanic feature in New Mexico?

Accepted Answer

A) a very recently active,basaltic cinder cone 
B) an extinct,highly symmetrical,composite volcanic cone 
C) the eroded remains of a volcanic pipe and radiating dikes 
D) an extinct,massive,rhyolitic shield volcano 
A) a very recently active,basaltic cinder cone 
B) an extinct,highly symmetrical,composite volcanic cone 
C) the eroded remains of a volcanic pipe and radiating dikes 
D) an extinct,massive,rhyolitic shield volcano

Question 4

________ magma is the most abundant type of magma erupted on Earth.

Accepted Answer

A) Basaltic 
B) Granitic 
C) Andesitic 
D) Pegmatitic 
A) Basaltic 
B) Granitic 
C) Andesitic 
D) Pegmatitic

Question 5

Where are the most active volcanoes in the world?

Accepted Answer

A) Washington State,in the United States 
B) Mexico 
C) Italy 
D) Hawaii 
A) Washington State,in the United States 
B) Mexico 
C) Italy 
D) Hawaii

Question 6

What type of volcano would be most likely to generate large landslides?

Accepted Answer

A) shield volcano 
B) cinder cone 
C) composite volcano 
D) caldera 
A) shield volcano 
B) cinder cone 
C) composite volcano 
D) caldera

Question 7

In the movie "Volcano" basaltic lava flows are shown running down flat streets at speeds faster than humans could run.From your knowledge of magma viscosity,is this realistic?

Accepted Answer

A) Yes,the viscosity of basalt magma is similar to water so it would flow at comparable rates. 
B) No,the viscosity of basaltic magma is much higher than water,and thus,would flow much slower than water. 
C) No,the viscosity of basaltic magma is much higher than water,and thus,would flow much faster than water. 
D) There is no way of knowing because basaltic magmas can have viscosities similar to water or higher depending on temperature and fluids,and thus there isn't enough information. 
A) Yes,the viscosity of basalt magma is similar to water so it would flow at comparable rates. 
B) No,the viscosity of basaltic magma is much higher than water,and thus,would flow much slower than water. 
C) No,the viscosity of basaltic magma is much higher than water,and thus,would flow much faster than water. 
D) There is no way of knowing because basaltic magmas can have viscosities similar to water or higher depending on temperature and fluids,and thus there isn't enough information.

Question 8

Volcanos have no significant impact on weather and climate.

Accepted Answer

A) True 
 B)False

Question 9

Many magmas are generated when solid rocks are carried to higher levels in the earth by flow and partially melted by decompression melting.

Accepted Answer

A) True 
 B)False

Question 10

Briefly summarize at least 4 major volcanic hazards.Describe the level of risk from most dangerous to least dangerous to human life.For each hazard indicate where the hazard is located relative to the volcano (on the volcano slopes,anywhere within several km of the volcano,anywhere within thousands of km of the volcano,in river valleys near the volcano,near bodies of water near the volcano,etc.)and consider if the probability of the hazard is very low,low,medium,high,or high,within the danger zone of the hazard.

Accepted Answer

Question undoubtedly has range of answer

Question 11

Paricutin is an example of a ________.

Accepted Answer

A) shield volcano 
B) cinder cone 
C) lava dome 
D) composite volcano 
A) shield volcano 
B) cinder cone 
C) lava dome 
D) composite volcano

Question 12

Mt.Rainier in Washington State is often thought to be the most hazardous volcano in the lower 48 states of the United States because ________.

Accepted Answer

A) it is close enough to Seattle and Tacoma,Washington that these cities could be destroyed in a pyroclastic flow 
B) the volcano is close enough to Seattle and Tacoma,Washington that a large explosive eruption could bury the cities in a large rock avalanche similar to the Mt.St.Helens eruption 
C) large amounts of glacial ice on the mountain could be melted by even a small eruption,potentially generating dangerous lahars that would travel rapidly down river valleys to heavily populated areas 
D) The statement is false; the volcano poses little hazard to humans except for the few who live close to the volcano. 
A) it is close enough to Seattle and Tacoma,Washington that these cities could be destroyed in a pyroclastic flow 
B) the volcano is close enough to Seattle and Tacoma,Washington that a large explosive eruption could bury the cities in a large rock avalanche similar to the Mt.St.Helens eruption 
C) large amounts of glacial ice on the mountain could be melted by even a small eruption,potentially generating dangerous lahars that would travel rapidly down river valleys to heavily populated areas 
D) The statement is false; the volcano poses little hazard to humans except for the few who live close to the volcano.

Question 13

A ________ is a near surface,intrusive igneous rock body that results from local inflation of a horizontal sill.

Accepted Answer

A) batholith 
B) dike 
C) laccolith 
D) volcanic neck 
A) batholith 
B) dike 
C) laccolith 
D) volcanic neck

Question 14

Match the name of the tectonic feature with the Figure.  
-oceanic spreading center

Accepted Answer

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

Question 15

Pillow lavas are basaltic magmas extruded as piles of bombs that accumulate in piles of rocks that look like a pile of pillows.

Accepted Answer

A) True 
 B)False

Question 16

What volcanic events formed Crater Lake,Oregon? When did they take place?

Accepted Answer

A) A powerful explosion blew away the top of a stratovolcano 10 million years ago. 
B) The crater of a large,extinct cinder cone filled with water 5 million years ago. 
C) Landslides and volcanic mudflows dammed the Mazama River 500 years ago. 
D) Caldera collapse followed major ash and pyroclastic-flow eruptions 6000 years ago. 
A) A powerful explosion blew away the top of a stratovolcano 10 million years ago. 
B) The crater of a large,extinct cinder cone filled with water 5 million years ago. 
C) Landslides and volcanic mudflows dammed the Mazama River 500 years ago. 
D) Caldera collapse followed major ash and pyroclastic-flow eruptions 6000 years ago.

Question 17

Which of the following is not a significant volcanic hazard?

Accepted Answer

A) injury or death by inhalation of air heavily laden with volcanic ash 
B) being overrun by a fast moving basaltic lava flow 
C) being caught in a river valley and being overcome by a volcanic mudflow/lahar 
D) a tsunami generated by a massive submarine volcanic eruption 
A) injury or death by inhalation of air heavily laden with volcanic ash 
B) being overrun by a fast moving basaltic lava flow 
C) being caught in a river valley and being overcome by a volcanic mudflow/lahar 
D) a tsunami generated by a massive submarine volcanic eruption

Question 18

Which one of the following statements concerning volcanic blocks and bombs is true?

Accepted Answer

A) Blocks are broken fragments of solid rocks; bombs have smaller sizes than lapilli. 
B) Bombs are guided to Earth by laser beams; blocks fall anywhere. 
C) Bombs are ejected as magma lumps; blocks are ejected as solid fragments. 
D) Bombs and blocks are both smaller than lapilli and cinders. 
A) Blocks are broken fragments of solid rocks; bombs have smaller sizes than lapilli. 
B) Bombs are guided to Earth by laser beams; blocks fall anywhere. 
C) Bombs are ejected as magma lumps; blocks are ejected as solid fragments. 
D) Bombs and blocks are both smaller than lapilli and cinders.

Question 19

When magma rises toward the surface,pressure decreases can lead to release of dissolved gases in a magma with a volume increase that can produce an explosion.

Accepted Answer

A) True 
 B)False

Question 20

the volcanoes of southwestern Alaska and the Aleutian Islands

Accepted Answer

composite/

Exam 9: Volcanoes and Other Igneous Activity

Pillow lavas are ________.

pahoehoe aa volcanic bomb pillow lava

Which of the following best describes Shiprock,a famous volcanic feature in New Mexico?

________ magma is the most abundant type of magma erupted on Earth.

Where are the most active volcanoes in the world?

What type of volcano would be most likely to generate large landslides?

In the movie "Volcano" basaltic lava flows are shown running down flat streets at speeds faster than humans could run.From your knowledge of magma viscosity,is this realistic?

Volcanos have no significant impact on weather and climate.

Many magmas are generated when solid rocks are carried to higher levels in the earth by flow and partially melted by decompression melting.

Paricutin is an example of a ________.

Mt.Rainier in Washington State is often thought to be the most hazardous volcano in the lower 48 states of the United States because ________.

A ________ is a near surface,intrusive igneous rock body that results from local inflation of a horizontal sill.

Match the name of the tectonic feature with the Figure. -oceanic spreading center

Pillow lavas are basaltic magmas extruded as piles of bombs that accumulate in piles of rocks that look like a pile of pillows.

What volcanic events formed Crater Lake,Oregon? When did they take place?

Which of the following is not a significant volcanic hazard?

Which one of the following statements concerning volcanic blocks and bombs is true?

When magma rises toward the surface,pressure decreases can lead to release of dissolved gases in a magma with a volume increase that can produce an explosion.

the volcanoes of southwestern Alaska and the Aleutian Islands

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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