Radioactive decay heats the core of the Earth, which heats the mantle, which produces upwellings of magma which boils the water in the Yellowstone aquifer. Steaming overflow runs into the Firehole River. The Firehole River connects to the Gibbon River. The Gibbon River connects to the Madison River. The Madison River connects to the Missouri River. The Missouri River connects to the Mississippi River. The Mississippi River connects to the Altantic Ocean. The Atlantic Ocean connects to the snow clouds. The snow collects on the Absaroka Mountains. The snowmelt connects to the aquifer, where the heat of the earth makes it boil and the overflow runs into the Firehole River...