| Question | Answer |
|---|---|
| Carbon film | Thin film of carbon residue preserved as a fossil |
| Cast | A type of body fossil that forms when crystals fill a mold or sediments wash into a mold and harden and harden into rock |
| Fossil | Remains, imprints, or traces of prehistoric organisms that can tell when and where organisms once lived and how they lived |
| Index fossils | Remains of species that existed on earth for a relatively short period of time |
| Mold | A type of body fossils that forms in rock when an organism with hard parts is buried, decays or dissolves and leaves a cavity in the rock |
| Per-mineralized remains | Fossils in which the spaces inside are filled with minerals from groundwater |
