Types of Volcanoes

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What is a Shield Volcano?

Back

A type of volcano characterized by its broad, gently sloping sides formed by the eruption of low-viscosity lava that can flow long distances.

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What is a Cinder Cone Volcano?

Back

A small, steep-sided volcano formed from the accumulation of volcanic debris, such as ash and cinders, around a single vent.

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What is a Composite Volcano?

Back

A tall, steep volcano made up of alternating layers of lava flows, ash, and other volcanic debris, often resulting in explosive eruptions.

Front

What type of eruption is likely with high viscosity lava?

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Explosive eruption.

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What type of lava flows slowly and has a rough, jagged surface?

Back

A'a lava.

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What is Pahoehoe lava?

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A type of lava that is smooth and ropy, flowing easily and quickly.

Front

What is the main difference between Shield and Composite volcanoes?

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Shield volcanoes have gentle slopes and are formed by low-viscosity lava, while Composite volcanoes are steep and formed by alternating layers of lava and ash.

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What is the significance of Mount St. Helens?

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It is an example of a Composite volcano that erupted explosively in 1980, reshaping the surrounding landscape.

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What are the main components of a volcano?

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Magma chamber, vent, crater, and lava flow.

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What is the role of viscosity in volcanic eruptions?

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Viscosity determines how easily lava flows; high viscosity leads to explosive eruptions, while low viscosity results in quiet flows.