But to the northeast, near a landmark called Sour Creek Dome, deep rocks are heating the magma trapped in the crust. That means that while magma under the western side of Yellowstone will likely ...

Lava domes are rounded, steep-sided mounds built by magma that is highly resistant to ... Left: An aerial view of the 600-foot lava dome in the crater of Washington's Mt. St. Helens, as seen ...