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Also called absolute dating, scientists use the decay of radioactive elements within the fossils or the rocks around the fossils to determine the age of the organism that was preserved.

This technique relies on the property of half-life.

Half-life is defined as the time it takes for one-half of a radioactive element to decay into a daughter isotope.

As radioactive isotopes of elements decay, they lose their radioactivity and become a brand new element known as a daughter isotope.

Obviously, this works only for things which were once living.

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Geologists often need to know the age of material that they find.

Adrian Grahams began writing professionally in 1989 after training as a newspaper reporter.

His work has been published online and in various newspapers, including "The Cornish Times" and "The Sunday Independent." Grahams specializes in technology and communications.

But, how can we determine how old a rock formation is, if it hasn’t previously been dated?

Scientists can use certain types of fossils referred to as index fossils to assist in relative dating via correlation.

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