Photo: Carlos Gutierrez with Reuters Lightning flashes around the ash plume at above the Puyehue-Cordon Caulle volcano chain near Entrelagos. The volcano in the Puyehue-Cordon Caulle chain, dormant for decades, erupted last month in south-central Chile, belching ash more than 6 miles into the sky. Winds fanned it toward neighboring Argentina, prompting the government to evacuate several thousand residents, authorities said.