Answer:
The age of a rock in years is called its
absolute age. It is determined by the natural radioactive decay of certain
elements, e.g., uranium, when decays turns into lead. The parent atoms of
uranium are converted into daughter atoms of lead over a fixed interval of time.
This interval is the decay constant.
The ratio of parent-daughter atoms
changes in a quantity that can be measured.
The radioactive half-life (the
amount of time required for one half of the parent atoms to be onverted to
daughter atoms) is used to calculate the age of the rock.
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