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ch 4
views of earths past
Term | Definition |
---|---|
original remains | actual bodies or body parts of organisms |
ice core | tubular sample 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 other events or oblects |
index fossil | fossils of organisms that were common, that lived in many areas, and that existed only during specific spans of time |
absolute age | the actual age of an event or object |
half-life | the time it takes for half an atom in a sample of a radioactive element to change from an unstableform into another form |
uniformitarianism | the idea that earth is always-changing place |
geological time scale | divides earth's history into intervals of time defined by major events or changes on earth |
fossils | traces or remains of living things from long ago |