Hich of the following is the primary technique for determining the absolute age of a rock?

measuring radioactive decay of element isotopes

comparing the rock to other geologic features

comparing the rock to similar rocks and noting the differences

measuring the dimensions of the rock

The correct option is A. Measuring radioactive decay of element isotopes

Explanation:

At the time of formation of rock, certain kinds of radioactive isotope elements get trapped in the rock. These radioactive isotopes are unstable and decay over a period of time forming daughter elements. A rock which will have more number of radioactive elements will be newer to a rock containing non-radioactive daughter elements.

The radioactive decay of each element can be measured by the half-life of elements. This is the primary technique to determine the absolute age of a rock.

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