X” really does mark a spot in Sybille Canyon along Wyoming Highway 34, but it doesn’t mark the site of buried treasure. It’s ...

Sheer drama. That’s what the Great Sand Dunes are. Starkly beautiful desert dunes set against a backdrop of pretty, ...

New research suggests that Earth's first crust, formed over 4.5 billion years ago, already carried the chemical traits we ...

Beneath the crust of North America, scientists have found that the deep roots of the continent are slowly dripping away in ...