Abeka 8th grade history section review 2.3

Most of the world's volcanic belts are located in the same places as the earth's earthquake belts. Why might this be considered evidence for the theory plate tectonics?

According to plate tectonics theory, earthquake and volcano belts both are likely to occur at or near the boundaries between plates.

What term describes a volcano that will probably not erupt again?

An extinct volcano

What is a volcano?

An opening in the earth's surface through which hot gases, ash, and molten rock are ejected from the earth's interior.

What are the three common types of volcanoes by structure?

Cindercone volcanoes, shield volcanoes, and composite volcanoes.

What narrow zone encircling the Pacific Ocean contains over half of the world's active volcanoes?

The Ring of Fire

Define pyroclastic flow.

The pyroclastic flow consists of a super heated cloud of gas and volcanic ash that travels swiftly down the volcanic slope as an avalanche.

What is a bowl-shaped thought to be caused by the collapse of an empty magma chamber?

calderas

Define igneous intrusion.

Mass of volcanic rock beneath the surface.

What is lava?

Molten rock that flows from volcanoes.

What are pyroclasts?

Particles or blocks of solid volcanic ejecta.