" our latest theory is that the crustal hot chamber is opening with melted rock . but we have no idea that long this mechanism going on before there either is an eruption or the inflow of molten rock stops and the eruption deflates again , " answered thompson . " activity in yellowstone fires up underground liquid and causes geysers of superheated liquid , and is responsible for the generated and subsequent eruption of new faithful .
There is a volcano in Yellowstone.