" our good evidence is that the crustal magma chamber is expanding with eruption rock . but we have no idea how lengthy this process passes on before there ever is an eruption or the flows of molten stone ends and the rafael deflates again , " added smith . volcanic activity in yellowstone heats up underground water this create etna of superheated lava , and is responsible for the creation and continuous eruption of old faithful .
There is a volcano in Yellowstone.