Forms of dating rocks

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Over time, the Ar remain embedded within the crystal, unless the rock is subjected to high temperatures after it forms.The sample must be analyzed using a very sensitive mass-spectrometer, which can detect the differences between the masses of atoms, and can therefore distinguish between Ar in the case of the K-Ar method).These break down over time in a process scientists call radioactive decay.Each original isotope, called the parent, gradually decays to form a new isotope, called the daughter.

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K proportion of 0.95, which is equivalent to an age of approximately 96 Ma.This is determined by drawing a horizontal line from 0.95 to the decay curve line, and then a vertical line from there to the time axis.

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