Absolute age dating definition
Now it is time to put those math skills to good use.
At one half-life, you would have approximately 50% Carbon-14 and 50% Nitrogen-14.
As the rock ages, more and more of the uranium changes into lead.
The absolute ages of some of the different geologic time periods are shown along the right side of the Staircase of Time.
Below is a chart of commonly used radiometric isotopes, their half-lives, and the daughter isotopes they decay into.
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