What causes geysers in Yellowstone Park?

Answer:

Geothermal heat from below the surface of the earth superheats groundwater and the pressure of the heat causes the water to shoot out of the ground.

First answer by Cataclysmic Beefstick. Last edit by Cataclysmic Beefstick. Contributor trust: 286 [recommend contributor recommended]. Question popularity: 2 [recommend question].