Chap. 4 note cards

Term Definition
Fossils Traces or remains of living things from long ago
Original remains Fossils that are the actual bodies or body parts of organisms
Ice core A tubular sample that shows the layers of snow and ice that built up over thousands of years
Relative age Is the age of an event or object in relation to other events or objects
Index fossils Fossils of organisms that were common, that lived in many areas, and that existed only during specific spans
absolute age The actual age of an event or object
half-life The length of time it takes half of the atoms in a sample of a radioactive element to change from an unstable form into another form
uniformitarianism Huttons theory or that the earth is an always-changing place
Geologic time scale divides the earths history into intervals of time defined by major events or changes on earth

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