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Radiometric dating can be compared to an hourglass.When the glass is turned over, sand runs from the top to the bottom.He is presently employed in the Space & Atmospheric Sciences Group at the Los Alamos National Laboratory.Radiometric dating--the process of determining the age of rocks from the decay of their radioactive elements--has been in widespread use for over half a century.

Some of the atoms eventually change from one element to another by a process called radioactive decay.

There are over forty such techniques, each using a different radioactive element or a different way of measuring them.

It has become increasingly clear that these radiometric dating techniques agree with each other and as a whole, present a coherent picture in which the Earth was created a very long time ago.

Assuming a strictly literal interpretation of the week of creation, even if some of the generations were left out of the genealogies, the Earth would be less than ten thousand years old.

Radiometric dating techniques indicate that the Earth is thousands of times older than that--approximately four and a half billion years old.

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