The Two Keys to Determining the Absolute Age of a Rock

The two keys to determining the absolute age of a rock are

A) measuring the abundance of parent isotope and measuring the abundance of daughter isotope.
B) knowing the half-life and measuring the abundance of parent and daughter isotopes.
C) knowing the composition and the geologic period the rock is from.
D) identifying all the minerals in the rock and knowing the half-life of each mineral.

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