Exam 5: Volcanoes and Volcanism

Look at the map of volcanoes of the world, and describe where most of the world's volcanoes are found.

The type of volcano that is the most common in the two major volcanic belts on Earth is ____________________.

Earth is the most volcanically active body in our solar system.

At Laki fissure in Iceland, due the eruption of the gas ____________________ crops failed and caused about 75% of the nation's livestock and 25% of the population to perish.

A lava tube is a hollow space left when the lava within a flowing tube drains away, leaving only the outside as hardened rock.

How could you distinguish a volcanic crater from a caldera?

Lavas of ____________________ composition are more likely to produce lava domes.

An example of a composite volcano is:

Most of the approximately 3,300 historic eruptions lasted:

Give an example of a caldera.

One indicator of an impending volcanic eruption that precedes all Hawaiian volcanic eruptions is a continuous ground motion called ____________________.

Why are there volcanoes on the west coast of North America but not on the east coast?

Lava domes form from:

An extinct volcano is one that:

What is volcanism, and types of rocks formed as a result?

Columnar joints caused by the contraction of lava as it cools form typically in a(n) ____________________ shape.

Why is Crater Lake in Oregon considered to be misnamed?

Pyroclastic materials include:

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

According to plate tectonic theory, why are there volcanoes in Hawaii?