Vocab
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| uniformitarianism | the principle that geologic processes that occurred in the past can be explained by current geologic processes.
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| relative age | the age of an object in relation to the ages of other objects.
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| 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.
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| law of crosscutting relationships | the principle that a fault or body of rock (intrusion) is younger than any other body of rock that it cuts through.
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| absolute age | the numeric age of an object or event, often stated in years before the present.
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| 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.
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| 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.
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| 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.
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| parent isotope | the original radioactive isotope.
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| daughter isotope | the final stable isotope.
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