Flashcard#8 Volcanoes Review

Front

What causes some volcanoes to have steep slopes?

Back

Viscous lava solidifies before it gets very far down slope.

Front

How does a volcanic eruption demonstrate Boyle's Law?

Back

When a volcano explodes, the volume of gas increases and pressure decreases.

Front

What geological process is represented by subduction?

Back

Subduction is the process where one tectonic plate moves under another and is forced to sink into the mantle.

Front

What must happen for rock in the mantle to melt?

Back

Temperature must rise.

Front

What type of volcano would you expect to find alternating layers of rock and ash?

Back

Composite volcano.

Front

What is the primary characteristic of mafic magmas?

Back

Mafic magmas are low in viscosity and typically form broad, shallow piles.

Front

What is the difference between felsic and mafic magmas?

Back

Felsic magmas are high in viscosity and silica content, leading to steep slopes, while mafic magmas are low in viscosity and form gentler slopes.

Front

What is a cinder cone volcano?

Back

A cinder cone volcano is a steep, conical hill formed from the accumulation of volcanic debris, primarily ash and small rocks.

Front

What is the role of pressure in the melting of rocks in the mantle?

Back

Increased pressure can prevent melting, but when combined with increased temperature, it can lead to melting.

Front

What is a pyroclastic flow?

Back

A pyroclastic flow is a fast-moving current of hot gas and volcanic matter that flows down the sides of a volcano.