Three active volcanoes simultaneously erupting and unleashing giant plumes of smoke were spotted by a NASA satellite as it passed over a remote archipelago in the South Atlantic Ocean. The three stratovolcanoes — a type of composite volcano built of layers of lava, ash and stone — are located on the South Sandwich Islands, which are about 1,700 miles (2,800 kilometers) southeast of Buenos Aires, Argentina. On Sept. 29, NASA's Aqua satellite captured the plumes from these volcano triplets in a false-color image.
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