why is dating different isotopes to cross check

References Alvarez W. These methods provide valuable and valid age data in most instances, although there is a small percentage of cases in which even these generally reliable methods yield incorrect results. Quaternary Dating Methods. Submit Cancel. Postcards from the Universe. Unstable isotopes, called radioactive isotopes , spontaneously decay over time releasing subatomic particles or energy in a process called radioactive decay. However, scientists can use igneous events to date sedimentary sequences.

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