Rocks from Greenland found on Iceland's west coast could link the late Roman Empire's fall to a spell of sudden climate change. But historians say that the real story is likely much more complicated.

For the first time, geoscientists detected the top of Yellowstone’s magma reservoir. It is active and dynamic, but not in danger of erupting, they found.

On a wave-battered rock in the northern Pacific Ocean, a fish called the sculpin grips the surface firmly to maintain ...