How did the science community piece together the absolute ages of rocks in the last half of the twentieth century?

Question

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The science community pieced together the absolute ages of rocks in the last half of the twentieth century through the measurement of radioactive decay, specifically through radiometric dating techniques such as carbon-14 and uranium-lead dating. These methods rely on the fact that unstable isotopes decay at a predictable and constant rate over time, allowing scientists to determine the age of a rock sample by measuring the ratio of unstable isotopes to their decay products.

How Did the Science Community Piece Together the Absolute Ages