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Geologic Time Vocab
| Term | Definition |
|---|---|
| decay | decompose |
| ratio | quantity |
| principle | rule or code |
| correlation | show a connection |
| relative age | age of rocks compared to other rocks |
| absolute age | actual age of the rock |
| geologic time | history of Earth |
| parent isotope | radioactive form of an element that decays to form a daughter isotope |
| index fossil | fossils used for dating geologic time period |
| daughter isotope | leftover after parent isotope decays |
| half-life | time it takes for half of an atom to give off radioactivity |
| radioactive dating | age of objects based on radioactive elements found in object |
| superposition | when two vertical lines interact |
| unconformity | gaps in geologic rock |
| inclusion | included |