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.
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From dinosaur skeletons to petrified wood, fossils help us learn about prehistoric creatures' anatomy and physiology. See pictures of incredible examples of fossils from around the world.
When it comes to fossils, specimens like Sue the Tyrannosaurus rex grab much of the attention. And while Sue is a staggering 67 million years old, she's a new kid on the block, compared to some of the oldest fossils ever found. What's older than Sue?
Birds then dinosaurs or dinosaurs then birds? It's a lot like the chicken-and-egg question, only with paleontologists. Who's arguing what these days, and what are they citing as evidence?
By Robert Lamb
When some people hear the word "dinosaur," they immediately think of outdated technology. Does that mean that the dinosaurs themselves were failures?
Researchers think the Chicxulub crater was caused by the massive asteroid that also killed off the dinosaurs 66 million years ago. What else do we know about this peak-ring crater?
By Mark Mancini
Ever since its discovery in 2000, a dinosaur fossil named Leonardo has held the interest of paleontologists the world over. A 3-D model of the animal even toured the world. So what's the big deal?
Everyone knows that once a bone has fossilized, it's hard as a rock, right? So how did scientists find soft tissue inside a broken dinosaur bone?
Dinosaur eggs and the embryos inside can teach us a lot about dinosaur reproduction and behavior. But how do scientists get the rocky embryos out from the equally rocky shells?
We all know the cartoons of prehistoric people running from dinosaurs aren't realistic. But many animals living today have ancestors from that time.
When they discover dinosaur remains, how do scientists know whether they found a male or a female? Would you believe it all comes down to one bone?
Diamonds are some of the most brilliant and expensive natural features Earth has to offer. This collection of images displays diamonds in all their uncut and polished shapes and sizes. Obligatory pictures of very large diamonds are included of course.