Volcanic Hazards Practice Flashcard

Front

How do volcanoes form along the Cascade Range?

Back

From subduction of an oceanic plate.

Front

What type of plate boundary occurs in association with the Cascade Range?

Back

Convergent.

Front

What is the best way volcanologists predict impending eruptions?

Back

Increases in releases of gases, tilting of the surface, and seismic activity.

Front

How do geologists know the frequency of eruptions?

Back

Through geochemical dating of the rocks to see how old the eruptions were.

Front

What is subduction?

Back

The process where one tectonic plate moves under another and sinks into the mantle.

Front

What are volcanic gases?

Back

Gases emitted by volcanoes, including water vapor, carbon dioxide, and sulfur dioxide.

Front

What is a hot spot?

Back

A location where magma from deep within the mantle melts through the crust above it.

Front

What is the Ring of Fire?

Back

A major area in the basin of the Pacific Ocean where many earthquakes and volcanic eruptions occur.

Front

What is a lava flow?

Back

The movement of lava from a volcano during an eruption.

Front

What is a pyroclastic flow?

Back

A fast-moving current of hot gas and volcanic matter that flows down the slopes of a volcano.