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Title: How Calderas Form.
Caption: This animation traces a process very similar to that which formed Crater Lake in the Oregon Cascade Range. It shows an eruption partially emptying a magma chamber, leading to the collapse of the composite volcano and the creation of a caldera, which subsequently holds a lake.
Keywords: composite volcanoes, stratovolcanoes,volcanism, magma, lava, pyroclastics, pyroclastic flows, calderas, cinder cones, Crater Lake