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| Question | Answer |
|---|---|
| uniformitarianism | The principle that geologic processes that occurred in the past can be explained by current geologic processes. |
| relative age | The age of an object in relation to the ages of other objects. |
| law of superposition | The principle that a sedimentary rock layer is older than the layers above it, and younger than the layers below it if the layers are not disturbed. |
| Law of cross-cutting relationships | The principle that a fault or body of rock (intrusion) is younger than any other body of rock that it cuts through. |
| absolute age | the numeric age of an object or event, often stated in years before the present. |
| Varve | A pair of sedimentary layers (one coarse, one fine) that is deposited in an annual cycle, commonly in glacial lakes, and that can be used to determine absolute age. |
| Radiometric Dating | A method of determining the absolute age of an object by comparing the relative percentages of a radioactive isotope and a stable isotope. |
| Half-life | The time required for half of a sample of a radioactive isotope to break down by radioactive decay to form a daughter isotope. |
| Parent Isotope | The original radioactive isotope. |
| Daughter Isotope | The final stable isotope. |
Created by:
gymnast4lyfe
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