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Fossils
| Term | Definition |
|---|---|
| body fossil | actual parts of an organism, unaltered or altered (bones, shells, leaf imprints) |
| trace fossil | evidence of life that is not a body fossil (tracks, burrows, casts) |
| sedimentary rock | the type of rock fossils are usually found in |
| relative age | its age compared to the ages of other rocks |
| index fossils | fossils of organisms that were widely distributed but only lived during a short period of time |
| fossil | the preserved remains or traces of an organism |
| petrified fossil | fossil formed when minerals replace all or part of an organism |
| mold | a hollow area that looks like an organism in sediment |