are fossils. Fossils are pieces of plants or animals that lived long ago and have been covered up and kept in Earth’s crust. Fossil bones are heavy, like rocks, but also very delicate. They always have cracks, so the bone can be broken into many pieces if treated roughly. Paleontologists use di ! erent glues and chemicals to fill in the cracks and hold the pieces together so that the bone can be collected without it su ! ering any damage. DINOSAUR BONES
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