Question 1

Which of the following types of volcanic eruption have occurred on Mount St.Helens since it began erupting in 1980?

Accepted Answer

A) eruption column 
B) pyroclastic flow 
C) volcanic dome 
D) all of these 
A) eruption column 
B) pyroclastic flow 
C) volcanic dome 
D) all of these D

Question 2

Which of the following was common to the eruptions of Vesuvius,Mount Pelée and Mount St.Helens?

Accepted Answer

A) they are all composite volcanoes 
B) earthquakes before the eruption 
C) small eruptions of tephra 
D) pyroclastic flows 
E) all of these 
A) they are all composite volcanoes 
B) earthquakes before the eruption 
C) small eruptions of tephra 
D) pyroclastic flows 
E) all of these E

Question 3

Which of the following is least likely to be a volcano?

Accepted Answer

A) a vent where magma and other volcanic material is erupted 
B) a hill with a crater formed at the site of an eruption 
C) a hill capped by volcanic rocks 
D) a fissure that erupts hot,molten lava 
E) a mountain that erupts only volcanic ash 
A) a vent where magma and other volcanic material is erupted 
B) a hill with a crater formed at the site of an eruption 
C) a hill capped by volcanic rocks 
D) a fissure that erupts hot,molten lava 
E) a mountain that erupts only volcanic ash C

Question 4

Which of the following is NOT true about shield volcanoes in the landscape?

Accepted Answer

A) They are large mountains with steep slopes. 
B) They can construct some of the world's largest volcanoes. 
C) They can be large or small. 
D) All of these. 
A) They are large mountains with steep slopes. 
B) They can construct some of the world's largest volcanoes. 
C) They can be large or small. 
D) All of these.

Question 5

Which site on the island is the least dangerous?

Accepted Answer

A) the location of Rock 1 
B) the location of Rock 2 
C) the location of Rock 3 
D) the area of the landslide blocks 
E) the area of the mudflow deposits 
A) the location of Rock 1 
B) the location of Rock 2 
C) the location of Rock 3 
D) the area of the landslide blocks 
E) the area of the mudflow deposits

Question 6

What is a main hazard of this type of volcano?

Accepted Answer

A) burning,building collapse,and suffocation from an eruption column and pyroclastic flows 
B) volcanic mudflows and landslides 
C) hot fragments thrown a short distance from the volcano 
D) destruction by moderately fluid lava flows that can flow far from the volcano 
A) burning,building collapse,and suffocation from an eruption column and pyroclastic flows 
B) volcanic mudflows and landslides 
C) hot fragments thrown a short distance from the volcano 
D) destruction by moderately fluid lava flows that can flow far from the volcano

Question 7

What type of basaltic feature is shown in this photograph?

Accepted Answer

A) vesicles 
B) volcanic bomb 
C) aa lava flow 
D) pahoehoe lava flow 
E) pyroclastic flow 
A) vesicles 
B) volcanic bomb 
C) aa lava flow 
D) pahoehoe lava flow 
E) pyroclastic flow

Question 8

What type of basaltic feature is shown in this photograph?

Accepted Answer

A) vesicles 
B) volcanic bomb 
C) aa lava flow 
D) pahoehoe lava flow 
E) pyroclastic flow 
A) vesicles 
B) volcanic bomb 
C) aa lava flow 
D) pahoehoe lava flow 
E) pyroclastic flow

Question 9

What types of rocks would be most common in the small volcano in this photograph?

Accepted Answer

A) scoria and other vesicular basalt 
B) basalt mostly formed in lava flows 
C) felsic and intermediate lava flows 
D) welded tuff and tephra 
E) none of these 
A) scoria and other vesicular basalt 
B) basalt mostly formed in lava flows 
C) felsic and intermediate lava flows 
D) welded tuff and tephra 
E) none of these

Question 10

Which of the following sites would most likely have less dangerous volcanoes? A is on an island arc,B is in the Andes,C is near Hawaii,D is along a mid-ocean ridge.

Accepted Answer

A) A and B 
B) B and C 
C) C and D 
D) A and C 
E) B and D 
A) A and B 
B) B and C 
C) C and D 
D) A and C 
E) B and D

Question 11

Which site has the highest hazard for lava flows?

Accepted Answer

A) 1,the suburbs of Tacoma 
B) 2,a valley near the volcano 
C) 3,the flanks of the volcano 
D) 4,the summit of the volcano 
A) 1,the suburbs of Tacoma 
B) 2,a valley near the volcano 
C) 3,the flanks of the volcano 
D) 4,the summit of the volcano

Question 12

Shield volcanoes commonly have:

Accepted Answer

A) fissure eruptions 
B) lava flows 
C) fire fountains 
D) dikes at depth 
E) all of these 
A) fissure eruptions 
B) lava flows 
C) fire fountains 
D) dikes at depth 
E) all of these

Question 13

Which of the following factors indicates a high risk for volcanic mudflows or lahars?

Accepted Answer

A) a shield volcano that forms a low mountain in the tropics 
B) a volcano whose hillslopes are covered with hard basaltic lava 
C) a volcano with a thick covering of snow or ice 
D) all of these 
A) a shield volcano that forms a low mountain in the tropics 
B) a volcano whose hillslopes are covered with hard basaltic lava 
C) a volcano with a thick covering of snow or ice 
D) all of these

Question 14

Which of the following is the best indicator that a volcano might be very dangerous?

Accepted Answer

A) gentle slopes that signify fast-flowing lavas 
B) rock analyses that indicate a low content of silica 
C) a volcano that contains andesite and welded tuffs 
D) ages that indicate the volcano last erupted 10 million years ago 
A) gentle slopes that signify fast-flowing lavas 
B) rock analyses that indicate a low content of silica 
C) a volcano that contains andesite and welded tuffs 
D) ages that indicate the volcano last erupted 10 million years ago

Question 15

What event triggered the main eruption of May 1980?

Accepted Answer

A) Melting snow caused a huge steam eruption. 
B) Magma encountered groundwater and exploded. 
C) A landslide removed rocks and released pressure on the magma. 
D) All of these. 
A) Melting snow caused a huge steam eruption. 
B) Magma encountered groundwater and exploded. 
C) A landslide removed rocks and released pressure on the magma. 
D) All of these.

Question 16

The main hazard of an eruption that forms a large caldera is:

Accepted Answer

A) burning,building collapse,and suffocation from an eruption column and pyroclastic flows 
B) volcanic mudflows and landslides 
C) hot fragments thrown a short distance from the volcano 
D) destruction by moderately fluid lava flows that can flow far from the volcano 
A) burning,building collapse,and suffocation from an eruption column and pyroclastic flows 
B) volcanic mudflows and landslides 
C) hot fragments thrown a short distance from the volcano 
D) destruction by moderately fluid lava flows that can flow far from the volcano

Question 17

What types of rocks would be common in a composite volcano?

Accepted Answer

A) felsic and intermediate lava flows 
B) pyroclastic rocks from an eruption column 
C) pyroclastic rocks from pyroclastic flows 
D) rocks with fragments formed by landslides and mudflows 
E) all of these 
A) felsic and intermediate lava flows 
B) pyroclastic rocks from an eruption column 
C) pyroclastic rocks from pyroclastic flows 
D) rocks with fragments formed by landslides and mudflows 
E) all of these

Question 18

Hazards associated with basaltic lava flows and eruptions are:

Accepted Answer

A) burial of roads and neighborhoods by lava flows 
B) house fires 
C) floods from catastrophic melting of ice 
D) all of these 
A) burial of roads and neighborhoods by lava flows 
B) house fires 
C) floods from catastrophic melting of ice 
D) all of these

Question 19

The eruption that occurred on Mount St.Helens was triggered by:

Accepted Answer

A) A huge landslide caused a lateral blast that knocked down trees and buildings. 
B) A fast-moving viscous lava flow flowed through the middle of Portland. 
C) A volcano that was so heavy that it caused part of the island to collapse. 
D) A scoria cone that sent up a large column of pyroclastic material. 
E) None of these. 
A) A huge landslide caused a lateral blast that knocked down trees and buildings. 
B) A fast-moving viscous lava flow flowed through the middle of Portland. 
C) A volcano that was so heavy that it caused part of the island to collapse. 
D) A scoria cone that sent up a large column of pyroclastic material. 
E) None of these.

Question 20

This igneous rock contains flattened pieces of pumice and small crystals of quartz and feldspar.What type of eruption probably formed this rock?

Accepted Answer

A) eruption of a low-viscosity,basaltic lava flow 
B) eruption of high-viscosity lava in a dome 
C) dome collapse that forms volcanic breccia 
D) eruption of a pyroclastic flow that forms a thick and hot deposit 
E) slow settling of ash from a tall eruption column forming a nonwelded tuff 
A) eruption of a low-viscosity,basaltic lava flow 
B) eruption of high-viscosity lava in a dome 
C) dome collapse that forms volcanic breccia 
D) eruption of a pyroclastic flow that forms a thick and hot deposit 
E) slow settling of ash from a tall eruption column forming a nonwelded tuff

Which of the following types of volcanic eruption have occurred on Mount St.Helens since it began erupting in 1980?

Which of the following was common to the eruptions of Vesuvius,Mount Pelée and Mount St.Helens?

Which of the following is least likely to be a volcano?

Which of the following is NOT true about shield volcanoes in the landscape?

Which site on the island is the least dangerous?

What is a main hazard of this type of volcano?

What type of basaltic feature is shown in this photograph?

What type of basaltic feature is shown in this photograph?

What types of rocks would be most common in the small volcano in this photograph?

Which of the following sites would most likely have less dangerous volcanoes? A is on an island arc,B is in the Andes,C is near Hawaii,D is along a mid-ocean ridge.

Which site has the highest hazard for lava flows?

Shield volcanoes commonly have:

Which of the following factors indicates a high risk for volcanic mudflows or lahars?

Which of the following is the best indicator that a volcano might be very dangerous?

What event triggered the main eruption of May 1980?

The main hazard of an eruption that forms a large caldera is:

What types of rocks would be common in a composite volcano?

Hazards associated with basaltic lava flows and eruptions are:

The eruption that occurred on Mount St.Helens was triggered by:

This igneous rock contains flattened pieces of pumice and small crystals of quartz and feldspar.What type of eruption probably formed this rock?

The Nature of Geology

Investigating Geologic Questions

Plate Tectonics

Earth Materials

Igneous Environments

Sedimentary Environments and Rocks

Deformation and Metamorphism

Geologic Time

The Seafloor and Continental Margins

Mountains, basins, and Continents

Earthquakes and Earths Interior

Climate, weather, and Their Influences on Geology

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Weathering, soil, and Unstable Slopes

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Exam 6: Volcanoes and Volcanic Hazards

Which of the following types of volcanic eruption have occurred on Mount St.Helens since it began erupting in 1980?

Which of the following was common to the eruptions of Vesuvius,Mount Pelée and Mount St.Helens?

Which of the following is least likely to be a volcano?

Which of the following is NOT true about shield volcanoes in the landscape?

Which site on the island is the least dangerous?

What is a main hazard of this type of volcano?

What type of basaltic feature is shown in this photograph?

What type of basaltic feature is shown in this photograph?

What types of rocks would be most common in the small volcano in this photograph?

Which of the following sites would most likely have less dangerous volcanoes? A is on an island arc,B is in the Andes,C is near Hawaii,D is along a mid-ocean ridge.

Which site has the highest hazard for lava flows?

Shield volcanoes commonly have:

Which of the following factors indicates a high risk for volcanic mudflows or lahars?

Which of the following is the best indicator that a volcano might be very dangerous?

What event triggered the main eruption of May 1980?

The main hazard of an eruption that forms a large caldera is:

What types of rocks would be common in a composite volcano?

Hazards associated with basaltic lava flows and eruptions are:

The eruption that occurred on Mount St.Helens was triggered by:

This igneous rock contains flattened pieces of pumice and small crystals of quartz and feldspar.What type of eruption probably formed this rock?

The Nature of Geology

Investigating Geologic Questions

Plate Tectonics

Earth Materials

Igneous Environments

Sedimentary Environments and Rocks

Deformation and Metamorphism

Geologic Time

The Seafloor and Continental Margins

Mountains, basins, and Continents

Earthquakes and Earths Interior

Climate, weather, and Their Influences on Geology

Glaciers, shorelines, and Changing Sea Levels

Weathering, soil, and Unstable Slopes

Streams and Flooding

Water Resources

Energy and Mineral Resources

Geology of the Solar System

Filters