Dinosaur Fossils
In the past century, one of the most amazing findings by scientists has been dinosaur bones. Dinosaur bones-also called fossils-are the remains of old dinosaur skeletons. Sometimes scientists who discover dinosaur fossils just find footprints in the dirt. Other times,they find enough fossils to make a complete dinosaur. But how do dinosaur bones that are millions of years old get turned into fossils? How can something buried beneath dirt and sand last for so long?