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Carbon-14 is continually being created in the atmosphere due to the action of cosmic rays on nitrogen in the air.

Carbon-14 combines with oxygen to create carbon dioxide.

These differing rates of decay help make uranium-lead dating one of the most reliable methods of radiometric dating because they provide two different decay clocks.

This provides a built-in cross-check to more accurately determine the age of the sample.

So, we see there are a number of different methods for dating rocks and other non-living things, but what if our sample is organic in nature?Radiometric dating, or radioactive dating as it is sometimes called, is a method used to date rocks and other objects based on the known decay rate of radioactive isotopes.Different methods of radiometric dating can be used to estimate the age of a variety of natural and even man-made materials.These two uranium isotopes decay at different rates. The half-life of the uranium-238 to lead-206 is 4.47 billion years.The uranium-235 to lead-207 decay series is marked by a half-life of 704 million years.

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