In Focus on 2013: The Year in Volcanic Activity "This been a particularly eventful year for the world's volcanoes. Out of an estimated 1,500 active volcanoes, 50 or so erupt every year, spewing steam, ash, toxic gases, and lava. In 2013, erupting volcanoes included Italy's Mount Etna, Alaska's Mount Pavlof, Indonesia's Mount Sinabung, Argentina's Volcán Copahue, and a new island emerging off the coast of Nishinoshima, Japan. In Hawaii, the famed Kilauea volcano continued to send lava flowing toward the sea. Collected below are scenes from the wide variety of volcanic activity on Earth over the past year. [36 photos]"