| A | B |
|---|
| fossil | preserved remains or other evidence of an organism |
| trace fossil | fossil formed by an animals movement |
| mold | mark or cavity |
| cast | mold filled with sediment |
| index fossil | fossil from a specific period of time |
| mineral replacement | process in which minerals replace tissues (ex. petrified wood) |
| amber | hardened tree sap |
| Example of a trace fossil | preserved footprints |
| This speeds up an organism's decay | warm temperatures in a wet climate |
| This will slow down an organism's decay | freezing temperatures |
