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Exam 5: Volcanoes and Volcanism

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Question 31

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Which is the correct ranking (in descending order) of regions with the most active volcanoes and volcanic activity?      1. Circum-Pacific belt 2. Mid-oceanic ridges 3. Mediterranean belt 4. Isolated sites like the Hawaiian Islands

A) 2, 1, 3, 4
B) 1, 3, 2, 4
C) 2, 3, 4, 1
D) 1, 2, 3, 4
E) 3, 2, 1, 4

F) A) and B)
G) All of the above

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Question 32

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What is the difference between an active volcano and a dormant volcano?

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An active volcano has erupted ...

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Question 33

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

An eruption of a viscous, felsic magma is likely to form a lahar.

Describe the volcanoes that form the Hawaiian Islands, especially on the island of Hawaii.

Why does most volcanism at spreading ridges go undetected?

Describe shield volcanoes. What are they composed of? Where are they found?

The two most active volcanic zones are the ____________________ belt and the ____________________ belt.

A nuée ardente is composed of fiery hot gases and dust.

The chemical composition of all lavas is the same.

Shield volcanoes are composed largely of lavas of ____________________ composition, they commonly have slopes that are ____________________, and their eruptions tend to be ____________________ in explosivity.

Which magma type usually erupts from fissures?

Completion When basalt lava is chilled rapidly in the water in an ocean or lake, it forms bulbous structures called ____________________.

Describe igneous activity at convergent plate boundaries.

The volcanic explosivity index (VEI) can be correlated with the number of deaths caused by an eruption.

The three main types of volcanoes are:

The volcanic explosivity index (VEI) is intended to:

Provide evidence as to why warning signals are not always indicative of impending volcanic eruptions?

The dominant gas emitted from volcanoes is ____________________.

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