Beneath Earth s surface, nearly 3,000 kilometers down, lies a mysterious layer where seismic waves speed up inexplicably. For ...

Earthquakes, volcanic eruptions, shifting tectonic plates—these are all signs that our planet is alive. But what is revealed ...

Hidden beneath the rolling plains of northwestern Oklahoma lies a geological masterpiece that feels plucked straight from the imagination of a Hollywood set designer.

The winding mountain roads of McDowell County offer little hint of the subterranean spectacle awaiting those curious enough to venture beneath the surface, making this natural wonder truly one of ...

A new panorama from NASA's 2001 Mars Odyssey orbiter shows one of the red planet's biggest volcanoes, Arsia Mons, poking through a canopy of clouds just before dawn. The European Space Agency's ...