Geology is the study of the composition and physical properties of rocks, minerals, gems and other related earth materials, including diamonds and crystals. Scientists gain an understanding of the Earth's history by studying its composition.
The Surge in Fossil Fuels Could End Radiocarbon Dating
Arizona's Grand Falls Gushes to Life Again
Aliens? Lasers? Water? What Caused the Al Naslaa Rock to Split So Precisely?
Everyone's on the Hunt for the Element Lithium
Cinnabar: Red, Beautiful — and Toxic
Rhodonite: A Mineral of Love, Roses and Eagles
Velociraptor Alert: The Feathered Dinosaur Quiz
River-bottom Bones: The Strange World of Underwater Fossil Hunting
There's a Rhino-shaped Cave in Washington State
Learn More / Page 5
Every time a new fossil is found, one of the first things scientists determine is how old that fossil really is. But how do they determine it, and how can they be completely accurate?
The sea scorpion may have been the largest bug to ever live on the Earth, according to a recent find. Learn more about the giant sea scorpion.
By Josh Clark
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.
By Kevin Bonsor
Whenever people talk about buying diamonds, they keep mentioning the four Cs. What do they have to do with diamonds?
Diamond engagement rings. Diamond anniversary bands. Diamond earrings and necklaces. And now, the right-hand diamond ring! The four Cs -- cut, clarity, carat and color. Find out what the fuss is all about.
By Kevin Bonsor
Diamonds are beautiful and popular - but not everyone can afford these gems. While man-made versions are less expensive, most lack the luster and brilliance of the real thing, except moissanite. See how it compares!
By Melissa Russell-Ausley