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Furthermore, the same method can produce different ages on different parts of the same rock.
Sometimes these are close but other times they are very different.
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When we look at sand in an hourglass, we can estimate how much time has passed based on the amount of sand that has fallen to the bottom.
Radioactive rocks offer a similar “clock.” Radioactive atoms, such as uranium (the parent isotopes), decay into stable atoms, such as lead (the daughter isotopes), at a measurable rate.
If the standard is of historically known age, such as would likely be used for testing Ar-Ar dating on sample of known age, then one would be more likely to get the correct age.Quick cooling or not having contact with the air can affect theoretical mechanisms for "resetting" the clock.Some times radiometric dating produces impossible results.Some rocks dated older than the 4.5 billion year evolutionary age for Earth. Isochron dating can also produce negative ages, by producing a negative slope.K-Ar and Ar-Ar can result in negative ages when atmospheric argon is considered.