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'Copahue' is a stratovolcano on the border between Argentina and Chile. There are nine volcanic craters along a 2 km (1.2 mi) line, and the eastern summit crater contains a briny, acidic 300 m (1000 ft) wide crater lake. Twentieth-century eruptions from the crater lake have ejected pyroclastic rocks and chilled liquid sulfur fragments.

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References

References

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★ Volcanes de Chile, , Oscar, González-Ferrán, Santiago, Chile: Instituto Geográfico Militar, , (in Spanish; also includes volcanoes of Argentina, Bolivia, and Peru)

★ The Andes: A Guide for Climbers (3rd ed.), , John, Biggar, Andes Publishing (Scotland), ,