Question 1

Which of the following volcanic features or textures suggest that significant amounts of water were present during an eruption?

Accepted Answer

A) vesicles 
B) phenocrysts 
C) lava ropes 
D) pillows 
A) vesicles 
B) phenocrysts 
C) lava ropes 
D) pillows

Question 2

Which of the following volcanic flows moves the most rapidly?

Accepted Answer

A) basaltic lava flows 
B) lahars 
C) pyroclastic flows 
D) rhyolitic lava flows 
A) basaltic lava flows 
B) lahars 
C) pyroclastic flows 
D) rhyolitic lava flows

Question 3

Which of the following statements about lava is true?

Accepted Answer

A) The viscosity of a lava increases as the silica content decreases. 
B) High temperature lavas are less viscous than low-temperature lavas. 
C) The more gas a lava contains,the less violent the eruption. 
D) All of the statements above are true. 
A) The viscosity of a lava increases as the silica content decreases. 
B) High temperature lavas are less viscous than low-temperature lavas. 
C) The more gas a lava contains,the less violent the eruption. 
D) All of the statements above are true.

Question 4

What type of volcanic flows likely formed the volcano depicted in the cross section below?

Accepted Answer

A) andesite flows 
B) basalt flows 
C) rhyolite flows 
D) volcanic mudflows 
A) andesite flows 
B) basalt flows 
C) rhyolite flows 
D) volcanic mudflows

Question 5

Volcanic rocks derived from the Yellowstone hot spot get progressively older to the southwest.Based on this information,in which direction is the North American plate moving?

Accepted Answer

A) northeast 
B) northwest 
C) southeast 
D) southwest 
A) northeast 
B) northwest 
C) southeast 
D) southwest

Question 6

Which of the following statements about the May 18,1980,climactic eruption of Mount St.Helens is false?

Accepted Answer

A) Earthquakes began to occur underneath the volcano 6 years before the eruption. 
B) Volcanic ash was erupted up to 25 kilometers into the atmosphere. 
C) Approximately 60 people were killed by the eruption. 
D) The eruption was immediately preceded by a large earthquake and landslide. 
A) Earthquakes began to occur underneath the volcano 6 years before the eruption. 
B) Volcanic ash was erupted up to 25 kilometers into the atmosphere. 
C) Approximately 60 people were killed by the eruption. 
D) The eruption was immediately preceded by a large earthquake and landslide.

Which of the following volcanic features or textures suggest that significant amounts of water were present during an eruption?

Which of the following volcanic flows moves the most rapidly?

Which of the following statements about lava is true?

What type of volcanic flows likely formed the volcano depicted in the cross section below?

Volcanic rocks derived from the Yellowstone hot spot get progressively older to the southwest.Based on this information,in which direction is the North American plate moving?

Which of the following statements about the May 18,1980,climactic eruption of Mount St.Helens is false?

The Earth System

Plate Tectonics: The Unifying Theory

Earth Materials: Minerals and Rocks

Igneous Rocks: Solids From Melts

Sedimentation: Rocks Formed by Surface Processes

Metamorphism: Alteration of Rocks by Temperature and Pressure

Deformation: Modification of Rocks by Folding and Fracturing

Clocks in Rocks: Timing the Geologic Period

Early History of the Terrestrial Planets

History of the Continents

Geobiology: Life Interacts With Earth

Earthquakes

Exploring Earths Interior

The Climate System

Weathering,erosion,and Mass Wasting: Interactions Between the Climate and Plate Tectonic Systems

The Hydrologic Cycle and Groundwater

Stream Transport: From Mountains to Oceans

Winds and Deserts

Coastlines and Ocean Basins

Glaciers: the Work of Ice

Landscapes: Tectonic and Climate Interaction

The Human Impact of Earths Environment

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Exam 12: Volcanoes

Which of the following volcanic features or textures suggest that significant amounts of water were present during an eruption?

Which of the following volcanic flows moves the most rapidly?

Which of the following statements about lava is true?

What type of volcanic flows likely formed the volcano depicted in the cross section below?

Volcanic rocks derived from the Yellowstone hot spot get progressively older to the southwest.Based on this information,in which direction is the North American plate moving?

Which of the following statements about the May 18,1980,climactic eruption of Mount St.Helens is false?

The Earth System

Plate Tectonics: The Unifying Theory

Earth Materials: Minerals and Rocks

Igneous Rocks: Solids From Melts

Sedimentation: Rocks Formed by Surface Processes

Metamorphism: Alteration of Rocks by Temperature and Pressure

Deformation: Modification of Rocks by Folding and Fracturing

Clocks in Rocks: Timing the Geologic Period

Early History of the Terrestrial Planets

History of the Continents

Geobiology: Life Interacts With Earth

Earthquakes

Exploring Earths Interior

The Climate System

Weathering,erosion,and Mass Wasting: Interactions Between the Climate and Plate Tectonic Systems

The Hydrologic Cycle and Groundwater

Stream Transport: From Mountains to Oceans

Winds and Deserts

Coastlines and Ocean Basins

Glaciers: the Work of Ice

Landscapes: Tectonic and Climate Interaction

The Human Impact of Earths Environment

Filters