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Term | Definition |
---|---|
Fossils | traces or remains of living things from long ago |
original remains | actual bodies or body parts of organisms |
ice core | tubular sample that shows the layers of snow and ice that have built up over thousands of years |
relative age | the age of an event or object in relation to the other events or objects |
index fossil | fossils of organisms that were common, that lived in many areas, and that existed only during specific spans of time |
absolute age | actual age of an event or object |
half-life | the length of time it takes for half of the atoms to change from an unstable form into another form |
uniformitarianism | the idea that earth is an always changing place and the same forces of change at work today were at work in the past |
geological time scale` | the summary of earth's history, divided into intervals of time defined by major events or changes on earth |