Global Volcanism Program | Image GVP-04119
A dark ash-rich column rises above Cerro Negro volcano during the 1968 eruption. The heavy ash cloud was distributed by prevailing winds to the west, darkening the sky in that direction while Las Pilas volcano in the background remains in the sunlight. Ashfall damaged about 700 sq km of croplands.
Photo by William Melson, 1968 (Smithsonian Institution).