The Doll's Theater of Carlsbad Caverns looks otherworldly and took ages to form. What other incredible sights await us below ground? See more »

Carbon-14 dating is something that you hear about in the news all the time. Everything from mastodons to the Shroud of Turin has been dated using this technique! Learn about how carbon-14 dating works and why it is so accurate! See more »

Earthquakes and volcanoes get all the press. But the landslides they trigger are often more devastating. What makes the ground suddenly rip downhill, taking trees and homes with it? See more »

Countless movies and television shows depict quicksand as some kind of living creature that sucks its victims down into a bottomless pit, never to be heard from again. Well, you can't believe everything Hollywood tells you. See more »

The world of our far-future descendants may be as unrecognizable to us as our bustling, urbanized world would be to our bewildered ancient forefathers. Will energy drive many of those changes? See more »

The 26th century doesn't roll off the tongue as easily as the 21st century does. But that hasn't stopped us from imagining what our hometown planet will be like in a few hundred years. Any guesses? See more »

One grows from the ground and one from the ceiling, but sometime's it's hard to remember which is the stalactite and which is the stalagmite. How do they get there, anyway? See more »

Erosion, the wearing away of the earth's surface by natural forces. The major causes of erosion include running water, wind, glaciers, and waves. See more »

Lava, molten rock ejected from volcanoes and fissures (cracks) in the earth's surface. See more »