Volcanoes Vocab

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Definition of Aa:

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A slow moving type of lava that hardens to form rough chunks.

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Definition of Batholith

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A mass of rock formed when a large body of magma cools inside the earth.

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Definition of Caldera

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The large hole at the top of a volcano formed when the roof of a volcano’s magma chamber collapses.

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Definition of Chemical Property

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Cannot be observed without changing the substance's composition.

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Definition of Cinder Cone

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A steep, cone-shaped hill or small mountain made of volcanic ash, cinders, and bombs piled up around a volcano’s opening.

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Definition of Composite Volcano

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A tall, cone-shaped mountain with alternating layers of lava and ash.

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Definition of Crater

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A bowl-shaped area around a volcano’s central opening.

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Definition of Dike

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A slab of volcanic rock formed when magma forces itself across rock layers.

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Definition of Dormant:

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A volcano that is not currently active, but may become active in the future.

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Definition of Hot Spot

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An area where magma from deep within the mantle melts through the crust above it.