Smoke and ash billow from the Chaitén volcano in southern Chile, which erupted on May 2, 2008, after lying dormant since circa 7,400 B.C. In this infrared image, captured on May 5 by NASA's Moderate Resolution Imaging Spectroradiometer (MODIS) onboard the Terra satellite, the 18-mile- (29-kilometer-) high plume wafts over Argentina on its way toward the Atlantic Ocean on the right. Clouds appear turquoise due to water crystals, whereas the warmer ash stands out as grayish-white. The explosion forced the evacuation of a nearby town, and some areas were buried under five feet (1.5 meters) of ash.