Bison once roamed across North America in massive numbers, and today, some states still protect thriving wild herds. From ...

Mauna Loa, the world's largest active volcano, is the mighty giant of Hawaii that's still bubbling away, waiting to be explored.

A fountain of lava was spewing from a Hawaii volcano Tuesday in the latest episode of an eruption that has paused and resumed ...

Scientists have assessed Yellowstone's chances of eruption by measuring electronic currents flowing deep within the Earth ...