| Term | Definition |
|---|
| law of superposition | A general law stating that in any sequence of sediments or rocks that has not been overturned, the youngest sediments or rocks are at the top of the sequence and the oldest are at the bottom. |
| cast fossil | on that is is filled in with some form of mineral or sediment, |
| mold fossil | leaves an imprint but is not filled in |
| epoch | A particular period of history |
| era | period of time characterized by particular circumstances or events, |
| radio active dating | a technique used to date materials, usually based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products |
| natural selection | The process in nature by which, only the organisms best adapted to their environment tend to survive |
| variation | an organism that has characteristics or changes resulting from chromosomal alteration |
| fossils | the perserved trace, imprint, or remains of a plant or animal |
| mutation | A change within an organism resulting in the creation of a new character or trait not found in the parental type |
| fossil record | A term used by paleontologists (see paleontology) to refer to the total number of fossils that have been discovered, as well as to the information derived from them |
| evolution | A gradual process in which something changes into a different and usually more complex or better form.The process of developing.Gradual development.Change in the genetic composition of a population during |
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