Venture too close to the hydrothermal vents dotted around Yellowstone National Park and you will be met by a powerful stench reminiscent of rotten eggs. These calderas are a (literal) hotbed of ...

A gigantic bulge in the north rim of the Yellowstone caldera is the latest sign of volcanic activity in the national park. Geologists call this type of bulge “volcanic uplift.” It’s often caused by ...