The giant supervolcano that lies under Yellowstone National Park is cooling off in the west but staying hot in the northeast.

Yellowstone is one of the planet's largest volcanic systems, a place where a plume of the Earth's molten ... In those events, volcanic ash reached from the Pacific ocean to Canada to Mexico.

Yellowstone is one of the planet's largest volcanic systems, a place where a plume of the Earth's molten core rises up through the solid rock of crust, heating and melting it to form reservoirs of ...

Yellowstone National Park ... about waking up under a blanket of molten ash anytime soon, lead author Nifna Bennington, geophysicist of the Hawaiian Volcano Observatory, told the Washington ...

Prior to this latest ash event, four similar emissions also occurred in the volcano on Tuesday morning, generating a dark plume 1,200 meters tall and raining ash over the south and southwest ...

Yellowstone is one of the planet's largest volcanic systems, a place where a plume of the Earth's molten core rises up through the solid rock ... those that have occurred at Yellowstone in the past ...

But what did Yellowstone look like before volcanic activity blew several large holes in the region and covered huge swaths of land with thick lava and ash flows? What was Yellowstone like before ...