Radioactive dating age of earth

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As magma cools, radioactive parent isotopes are separated from previously formed daughter isotopes by the crystallization process.

By measuring the ratio of lead to uranium in a rock sample, its age can be determined.At time 1, 50% of the parent atoms remain; at time 2, only 25% remain, and so on.Radiometric dating works best on igneous rocks, which are formed from the cooling of molten rock, or magma.This means that as radioactive parent elements decay, they and their daughters are trapped together inside the crystal.If, however, the rock is subjected to intense heat or pressure, some of the parent or daughter isotopes may be driven off.

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