Petrified wood is a fossil that is the remains of ancient vegetation, most commonly ancient trees. It occurs by a natural action known as permineralization, a process in which mineral deposits take on ...

Once upon a time on Mars, there was a crater that had a massive lake that may have hosted life. Now researchers are saying that a whole variety of organisms could have flourished there. Sure, that ...

UNGA ISLAND, Alaska — If you want to stroll through the only forest in the Shumagin Islands, you have to wear rubber boots and wait until the tide goes out. In the Shumagins, where the wind never ...

Stretching to the horizon, the gray-white earth rises in peaks, like a well-whipped meringue petrified into mud and rock. A keen wind whips these otherworldly hills, while the land underfoot is ...

Petrified Forest National Park, 18 miles southeast of Holbrook, is world-renowned for its petrified wood deposits, but much less known for its mining history and potash deposits. The area is located ...