Lascar Volcano, Chile. This 5,641 meter high cone is one of the most active in the Central Andes. Eruptions of pyroclastic flows in 1993 were accompanied by ash deposits that dusted Buenos Aires in Argentina. The crater is 800 meters wide, and the older flows of andesite that descend the volcano are tens of meters thick. The flow levees and transverse ridges on the flow near the center of the photo are particularly striking. Photo copyright Peter Francis.
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