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The heat from a volcanic eruption releases all the argon from the molten rock and disperses it into the atmosphere.
Measuring the proportions of argon-39 and argon-40 within a sample allows the age of the sample to be determined.
The number of tracks increases over time at a rate that depends on the uranium content.
It is possible to calculate the age of a sample by measuring the uranium content and the density of the fission tracks.
This technique is, however, useful for providing relative dates for objects found at the same site.
Another useful chemical analysis technique involves calculating the amount of nitrogen within a bone.