Some of the unusual rocks carry stories about water on Mars. One has hints of long-gone microbes. All tell of a dynamic, complex planet.

While the identity of the tunnel-makers remains elusive, one thing is clear—these million-year-old structures hold secrets ...

Unusual structures of unknown origin discovered in desert rocks have been documented in a new study. In the desert regions of ...

A strange rock covered in tiny spheres may hold secrets to Mars’ watery — or fiery — past.

The Guinness World Record for the oldest Earth rock is currently held by the Nuvvuagittuq greenstone belt, which is listed as ...

The study also provides a new approach to solving one of the biggest enduring scientific mysteries: when did plate tectonics ...

The Arizona desert features some of the most breathtaking geological formations and scenic vistas on Earth. And nowhere is ...