A) are enormous peaky volcanic cones B) produce enormous volcanic eruptions C) erupt about once a century D) are enormous peaky volcanic cones that produce enormous volcanic eruptions E) all of these A) are enormous peaky volcanic cones B) produce enormous volcanic eruptions C) erupt about once a century D) are enormous peaky volcanic cones that produce enormous volcanic eruptions E) all of these

Exam 5: Volcanoes and Volcanism

At Laki fissure in Iceland,the eruption of the gas ____________________ caused about 75 percent of the nation's livestock to die,25 percent of the population to die,and crops to fail.

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Question 1

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sulfur dioxide

Briefly explain how magma can originate at spreading zones if temperatures at such shallow depths cannot produce melting alone.

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Question 2

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The material is kept from melting because the lithostatic pressure of the overlying rock raises its melting temperature.The divergence of the plates and the fracturing that accompanies it reduces the pressure and lowers the material's melting temperature,which allows the rock to melt and become magma.

How is volcanism destructive? What are two reasons that it is primarily a constructive process?

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Some volcanic eruptions are explosive and they blow a lot of material outward so volcanism can be considered destructive.But volcanism also builds up material,including at the volcanoes themselves and at lava flows.Large islands in the ocean,such as Hawaii,are constructed entirely of material from volcanic eruptions.New seafloor is created by volcanic processes.Also,the early atmosphere and oceans were filled with gases that came from the interior of the Earth,through the mechanism of volcanism.

Most of the approximately 3,300 historic eruptions lasted how long?

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Question 4

Where are most volcanoes located?

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Question 5

Why is Crater Lake in Oregon considered to be misnamed?

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Question 6

What does harmonic tremor indicate is happening beneath the surface of a volcano?

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Question 7

The eruption that buried the city of Pompeii,Italy in 79 A.D.was that of Mount ______________,which prior to the eruption had been quiet for at least years.

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Question 8

The chemical composition of all lavas is the same.

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Question 9

The eruption of Mount St.Helens was one of the largest and deadliest in the world in historic times.

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Question 10

Alaska's volcanoes are

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Question 11

Distinguish aa from pahoehoe flows.

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Question 12

Why are some places (e.g.,northern California)more likely to experience volcanic eruptions than others (e.g.,New York)?

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Question 13

Why does most volcanism at spreading ridges go undetected?

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Question 14

What do lava domes form from?

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Question 15

Supervolcanoes ____.

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Question 16

Mount Vesuvius is part of a chain of volcanoes along Italy's south coast where the plate is being subducted beneath the plate.

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Question 17

Discuss what volcanologists look for in trying to determine if a volcano is about to erupt.

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Question 18

Cinder cones rarely reach heights greater than ; they are composed of material of composition.

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Question 19

Volcanic activity that takes place away from plate boundaries is the result of volcanism at a(n).In the U.S.,an example of this type of volcanism in the ocean is ; an example on land is .

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Question 20

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Exam 5: Volcanoes and Volcanism

At Laki fissure in Iceland,the eruption of the gas ____________________ caused about 75 percent of the nation's livestock to die,25 percent of the population to die,and crops to fail.

Briefly explain how magma can originate at spreading zones if temperatures at such shallow depths cannot produce melting alone.

How is volcanism destructive? What are two reasons that it is primarily a constructive process?

Most of the approximately 3,300 historic eruptions lasted how long?

Where are most volcanoes located?

Why is Crater Lake in Oregon considered to be misnamed?

What does harmonic tremor indicate is happening beneath the surface of a volcano?

The eruption that buried the city of Pompeii,Italy in 79 A.D.was that of Mount ____________________,which prior to the eruption had been quiet for at least ______ years.

The chemical composition of all lavas is the same.

The eruption of Mount St.Helens was one of the largest and deadliest in the world in historic times.

Alaska's volcanoes are

Distinguish aa from pahoehoe flows.

Why are some places (e.g.,northern California)more likely to experience volcanic eruptions than others (e.g.,New York)?

Why does most volcanism at spreading ridges go undetected?

What do lava domes form from?

Supervolcanoes ____.

Mount Vesuvius is part of a chain of volcanoes along Italy's south coast where the ____________________ plate is being subducted beneath the ____________________ plate.

Discuss what volcanologists look for in trying to determine if a volcano is about to erupt.

Cinder cones rarely reach heights greater than ____________________; they are composed of ____________________ material of ____________________ composition.

Volcanic activity that takes place away from plate boundaries is the result of volcanism at a(n)____________________.In the U.S.,an example of this type of volcanism in the ocean is ____________________; an example on land is ____________________.

Understanding Earth: A Dynamic and Evolving Planet

Plate Tectonics: A Unifying Theory

Minerals The Building Blocks of Rocks

Igneous Rocks and Plutons

Weathering, Erosion, and Soil

Sediment and Sedimentary Rocks

Metamorphism and Metamorphic Rocks

Earthquakes and Earth's Interior

Deformation,Mountain Building,and Earth's Crust

Mass Wasting

Running Water Streams and Rivers

Groundwater

Glaciers and Glaciation

The Work of Wind and Deserts

Oceans, Shorelines, and Shoreline Processes

Geologic Time: Concepts and Principles

Organic Evolution The Theory and Its Supporting Evidence

Precambrian Earth and Life History

Paleozoic Earth History

Paleozoic Life History

Mesozoic Earth and Life History

Cenozoic Earth and Life History

Geology in Perspective

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The eruption that buried the city of Pompeii,Italy in 79 A.D.was that of Mount ______________,which prior to the eruption had been quiet for at least years.

Mount Vesuvius is part of a chain of volcanoes along Italy's south coast where the plate is being subducted beneath the plate.

Cinder cones rarely reach heights greater than ; they are composed of material of composition.

Volcanic activity that takes place away from plate boundaries is the result of volcanism at a(n).In the U.S.,an example of this type of volcanism in the ocean is ; an example on land is .