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The large hole at the top of a volcano formed when the roof of a volcano's magmachamber collapses.
A steep, cone-shaped hill or small mountain made of volcanic ash, cinders, and bombs piled up around a volcano's opening.
A tall, cone-shaped mountain in which layers of lava alternate with layers of ash and other volcanic materials.
A wide, gentle sloping mountain made of layers of lava and formed by quiet eruptions.
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