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Exam 5: Volcanoes and Volcanism

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Question 41

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How did recent eruptions of Mount Pinatubo in the Philippines and Kilauea in Hawaii differ?

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Mount Pinatubo's eru...

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Question 42

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How do columnar joints form?

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In a lava flow,especially a mafic one,a ...

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Question 43

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How is the behavior of gases different in a quiet and an explosive eruption?

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

Volcanoes were named for Vulcan,the Roman deity of fire.

The three main types of volcanoes are:

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

Why does most volcanism at spreading ridges go undetected?

Pyroclastic sheet deposits are thin lava flows that often exhibit columnar jointing.

Why are the volcanoes of Hawaii shield volcanoes the same as spreading ridges?

Besides monitoring,what other knowledge helps geologists determine what to expect for eruptions from a given volcano?

What is a lahar?

The chemical composition of all lavas is the same.

Composite volcanoes are also known as ____________________ and are composed of both ____________________ flows and ____________________ material.

Distinguish aa from pahoehoe flows.

The dominant gas emitted from volcanoes is ____________________.

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

Which magma type usually erupts from fissures?

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

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