Mount St. Helens — Day before the 1980 eruption, which removed much of the northern face of the mountain, leaving a large crater
Photo Credit: By Harry Glicken, USGS/CVO - USGS photo of Mt. Saint Helens, Public Domain, https://commons.wikimedia.org/w/index.php?curid=634392

Colorful ash in the Valley of Ten Thousand Smokes —
Photo Credit: By Peter Hamel - nps.gov, Public Domain, https://commons.wikimedia.org/w/index.php?curid=4433276

Novarupta geologic cross section — By Hildreth, W., and Fierstein, J. - The Novarupta-Katmai eruption of 1912—largest eruption of the twentiethcentury; centennial perspectives: U.S. Geological Survey Professional Paper 1791
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=71284910

Novarupta — Novarupta's lava dome in July 1987
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=342705

Santa María, 1902 eruption —
Photo Credit: By Julio Yaquier, 1902 - Video de Luis Escobar, Public Domain, https://commons.wikimedia.org/w/index.php?curid=36665381

Steam rises from Santiaguito — The area of the flank destroyed by the 1902 eruption can be clearly seen. Lahar deposits snake down river valleys to the left of the image
Photo Credit: By NASA - http://earthobservatory.nasa.gov/Newsroom/NewImages/images.php3?img_id=7762, Public Domain, https://commons.wikimedia.org/w/index.php?curid=3382934

Santa María, 1902 eruption —
Photo Credit: By Unknown - Weltrundschau zu Reclams Universum 1902, Public Domain, https://commons.wikimedia.org/w/index.php?curid=11772987

Santa Maria Volcano — The volcano as seen from the nearby city of Quetzaltenango
Photo Credit: By Huista at English Wikipedia - Transferred from en.wikipedia to Commons., Public Domain, https://commons.wikimedia.org/w/index.php?curid=3382941

1615 illustration of the ashfall on Arequipa — The City of Arequipa during the catastrophic eruption of the volcano Huaynaputina (1600). Tons of ashes fall upon the city.
Photo Credit: By Felipe Huaman Poma de Ayal - http://www.kb.dk/permalink/2006/poma/1061/es/text/?open=id3090306, Public Domain, https://commons.wikimedia.org/w/index.php?curid=6304832

The volcanic zones of the Andes —
Photo Credit: By Chiton magnificus (talk) - I (Chiton magnificus (talk)) created this work entirely by myself., Public Domain, https://commons.wikimedia.org/w/index.php?curid=17830049

Huaynaputina — View of the crater and part of the nearby valley.
Photo Credit: By http://anarchy.kalarupa.com/2010/huaynaputina/ - http://anarchy.kalarupa.com/2010/huaynaputina/, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=32786435