Keywords: Yellowstone Caldera.svg validSVG en At Yellowstone and some other volcanoes some scientists theorize that the earth's crust fractures and cracks in a concentric or ring-fracture pattern At some point these cracks reach the magma reservoir release the pressure and the volcano explodes The huge amount of material released causes the volcano to collapse into a huge crater ”a caldera From nps gov File Yellowstone_Caldera gif which is from http //www nps gov/archive/yell/tours/fountainpaint/hotspot_yell htm Kbh3rd 2009-10-04 thumb left<br> Yellowstone Caldera fr svg 80px Diagrams of Yellowstone Caldera Diagrams of volcanoes SVG geology Calderas Diagrams of calderas |