Iztaccíhuatl, a massive 450 cu km stratovolcano SE of Mexico City, is seen here from the SW. The summit of the compound volcano is composed of several overlapping volcanoes, including the northernmost peak, La Cabeza (left), the snow-capped high point El Pecho, and Las Rodillas (below the lower Ayoloco glacier at the right-center). Most activity ceased during the Pleistocene, and the volcano has been extensively glaciated, as seen by the sharp-crested glacial moraines at the left-center below the Ayoloco glacier. Photo by José Macías, 1995 (Universidad Nacional Autónoma de México).