| A | B |
|---|
| fossil | remains, imprints, or traces of prehistoric organisms |
| trace fossil | evidence of the activities of once living organisms such as footprints |
| mineral replacement fossil | fossil made by the tiny spaces of hard parts filling with minerals |
| carbon film fossil | fossil formed when heat and pressure cause an organism's organic material is released as a gas and leaves behind an imprint |
| mold fossil | a hollow impression made after an organism has decayed and dissolved |
| preserved remain fossil | fossil formed from amber, ice or tar trap and preserve the soft parts of an organism |
| sedimentary | type of rock that fossils form in |
| decomposition | must be prevented in order for fossils to form |
| cast fossil | a replica of an organism formed by mineral-rich water filling in the mold |
