| A | B |
|---|
| geology | a science that deals with the history of earth and its life |
| geologic time scale | outline of earths history |
| era | the largest division of geologic time |
| big bang theory | suggests that all matter and space were once concentrated in a single great dense mass.The mass exploded into billions of galazies that are moving away from each other |
| theory | the analysis of a set of facts in their relation to one another |
| pangaea | all the continents on earth were once one giant land mass. pangaea is the name given to this land mass. it broke aparte in paleozoic era |
| fossils | a record of past life in the form of a trck, a trace or ramains preserved in rock. |
| index fossils | a fossil with a narrow time range and wide spatial distribution that is used in the indentifacation of related geologic formations. |
| trilobite | an index fossil from the paleozoic era |
| ammonite | an index fossil from the mesozoic era |
| extinct | no longer existing |
| relative dating | the process of determing whether one event happened before or after another |
| law | under or within the provisions of the law |
| radiometric dating | a technique that uses radioactivity to find the aproximate age of certain rocks |
| half-life | the amount of time needed for 1/2 of the radioactive atoms to break down |
