" our greatest evidence is that the crustal magma cavity is fills with molten rock . but we have no known that far this procedure lasts on before there either is an eruptions or the decrease of molten rock leaves and the caldera deflates again , " added richards . " activity in colorado heats up underground water which causes geysers of superheated rock , and is responsible for the creation and constant activity of long loyal .
There is a volcano in Yellowstone.