| A | B |
|---|
| Geology | The scientific study of the origin, history, and structure of the Earth. |
| Geologic Time Scale | An outline of Earth's histoey |
| Era | The largest divisions of geologic time |
| Theory | Ideas supported by evidence |
| Big Bang Theory | Suggests that all matter ( anything that has weight and takes up space ) and space were once concentrated in a single great dense glowing mass. The mass exploded into billions of galaxies that are moving away from each other. |
| Law | Ideas that can be tested and prooven. |
| Pangaea | All the continents on Earth were once one giant land mass. Pangaea is the name given to this land mass. It broke apart in the Mesozoic era. |
| Fossils | A record of past life in the form of a track, a trace or remains preserved in rock. |
| Index Fossils | Used to date the rock layer they are found in. |
| Trilobite | An index fossil from the Paleozoic era |
| Ammonite | Index fossil from the Mesozoic era. |
| Extinct | A species that is no longer living. |
| Relative Dating | Arrange events in order. |
| Radiometric Dating | A technique that uses radioactivity to find the approximate age of certain rocks. |
| Half-life | The amount of time needed for 1/2 of the radiactive atoms to break down. |
