Answer:
The process that scientists use to assign approximate ages to the epochs, periods, and eras of the geologic time scale is based on the dating techniques of radiometric dating and stratigraphy. Radiometric dating is a technique that uses the principles of nuclear physics to determine the age of an object. Stratigraphy is the study of the layers of sedimentary rocks. When scientists use radiometric dating and stratigraphy to date an object, they use a series of radioactive elements to calculate the object's age.
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