Science Olympiad Dynamic Planet Practice Test

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What defines a composite volcano?

  1. A cone-shaped hill made of ash

  2. A tall mountain composed of alternating layers of lava and ash

  3. A gently sloping mountain formed by quiet eruptions

  4. A volcano that is currently active

The correct answer is: A tall mountain composed of alternating layers of lava and ash

A composite volcano is characterized by its structure, which consists of alternating layers of lava flows, volcanic ash, and other volcanic debris. This creation process results in a tall, steep-sided mountain, often reaching significant heights. The layers indicate a history of both explosive eruptions and more effusive lava flows, making composite volcanoes complex in terms of their eruptive behavior. Their eruptions are typically more violent compared to other types of volcanoes due to the viscous nature of the magma, which can trap gas and lead to explosive activity. The layering of materials reflects the different types of volcanic activity that occur over time, contributing to the dynamic nature of these geological formations.

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