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Vocabulary the Past

Flora - Geologic Time Vocabulary Study Stack

QuestionAnswer
states that in an undisturbed sequence of sedimentary rock layers, each bed is older than the layers above and younger than the layers below principle of superposition
remains or traces of an organism preserved from the geologic past fossil
a fossil that is associated with a particular span of geologic tme and can be used to correlate rock layers index fossil
a surface that represents a break in the rock record, caused by erosion or the lack of deposition unconformity
the time it takes for half of the atoms of a radioactive substance to decay half-life
the concept that the processes that shaped the Earth in the past are the same as those operating today uniformitarianism
the process by which rocks are placed in their proper sequence or order without identifying the actual dates relative dating
the decay of an atom of one element to form another element radioactive decay
the process of using radioactivity to calculate the ages of rocks and minerals that contain radioactive isotopes radiometric dating
determining the age, in years, of rocks or other objects, using the radioactive decay of their atoms absolute dating
the spontaneous decay of certain unstable atomic nuclei radioactivity
a method for determining age by comparing the amount of carbon-14 to the amount of carbon-12 in a sample radiocarbon dating
Created by: sflora
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