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This technique relates changes in amino acid molecules to the time elapsed since they were formed. It is commonly used in earth science to determine the age of rock formations or features or to figure out how fast geologic processes take place for example, how fast marine terraces on Santa Cruz island are being uplifted. Uranium eventually decays into lead, and lead does not normally occur in zircon, except as the radioactive decay product of uranium. He would simply change his assumptions about the history of the rock to explain the result in a plausible way. It is an accurate way to date specific geologic events. Return to text. Age estimates can be cross-tested by using different isotope pairs.

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Everything Worth Knowing About ... Scientific Dating Methods

A geologist works out the relative age of a rock by carefully studying where the rock is found in the field. Current understanding of the history of life is probably close to the truth because it is based on repeated and careful testing and consideration of data. The fact that the age we calculate is reproducible for these different systems is significant. Therefore, by measuring the ratio of lead to uranium in a crystal of zircon, you can tell how much uranium there originally was in the crystal, which, combined with knowing the radioactive half-life of uranium, tells you how old the crystal is. Lots of radio-isotope dates are not reported, but are sitting in the researchers' files waiting for time to figure out what is going on with them.

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