" our best idea is that the crust magma chamber is fill with molten stone . but we have no idea so long this process goes on before there apparently is an eruption or the surges of flaming rock continues and the caldera deflates again , " added hunter . volcanic activity in yellowstone heats up underground water which create geysers of boilers water , and is accounted for the birth and continuous retreat of old faithful .
There is a volcano in Yellowstone.