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Traditionally there are two different structures that can be left behind. Although both structures are a type of hole, there are general size requirements for each. If a smaller volcano suffers a collapse and the hole is less than 1 mile in diameter, it is called a crater. If a larger volcano collapses and the hole is larger than 1 mile in diameter, it is called a caldera.

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8y ago
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10y ago

A Caldera, or crater

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Q: When a volcano collapses what is the hole left behind called?
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