| A | B |
|---|
| trilobite | an index fossile from the paleozoic era |
| index fossile | a fossile with a narrow time range and spatial distribution that is used in the indentifacation of realated geologic formations |
| theory | the analysis of a set of facts in their relation to one another |
| era | the largets divisionof geologic time |
| pangaea | all the continets on earth were once one giant land mass. Pangaea is the name givin to this land mass.IT broke of in the palezoic era |
| ammonite | an index fossile from the mesozoic era |
| relative dating | the process of determining whether one event happend or after another |
| extinct | no longer existing |
| law | under or within the provisions of the law |
| big bang theory | suggets that all matter and space were once concentrated in a single great dense mass. The mass exploded into billions of galexzies that are moving away from |
| geology | a science that deals with the history of the earth and its life |
| geologic time scale | outline of earths history |
| fossils | a record of past life in the form track, a trace or remains preserved in rock |
| half-life | the period requird for the disintegration of half of the atoms in a sample of some specific radioactive substance |
| radiometric dating | A device that measures the intensity of radiant energy, consisting of a partially evacuated glass bulb containing lightweight vertical vanes, each blackened on one side, suspended radially about a central vertical axis to permit their revolution about the axis as a result of incident radiation. |
