The stunning scenery of the American West is seen in pictures of mesas, buttes, arches and hoodoos, ... metamorphic and igneous rocks found across the vastness of this magical land.

Microbes have been discovered alive inside 2-billion-year-old rock, offering a rare window into Earth’s deep past. Found in ...

Our planet has been asteroid-smashed, melted and eroded, enough that most of its original armor has been long buried. Except ...