The gem is second in size only to the Cullinan diamond unearthed in South Africa in 1905.
A babbling river on Mars may have pushed pebbles along for some 30 miles -- according to new analysis of images taken by the Curiosity rover.
Route setters armed with drills search for untouched cliffs and boulders and design new paths for climbers.
A mysterious group of delicately balanced rocks that should not exist has led to a revelation about the San Andreas Fault.
Bolts from the sky can have an effect that was previously thought only to be created by a meteorite striking Earth. →
NASA's Mars rover Curiosity went out of its way to investigate a rock the likes of which it has never seen before on the Red Planet.
Both the North side and South Col of Mt. Everest are dangerous -- but in different ways.
This assortment of monoliths represent some of the biggest rocks on Earth.
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