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So, we have a “clock” which starts ticking the moment something dies.

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

C14 is continually being created and decaying, leading to an equilibrium state in the atmosphere.

When the carbon dioxide, containing C14 as well as stable C12 and C13, is taken in by plants it is no longer exposed to the intense cosmic ray bombardment in the upper atmosphere, so the carbon 14 isotope decays without being replenished.

by Tas Walker A geologist works out the relative age of a rock by carefully studying where the rock is found in the field.

The field relationships, as they are called, are of primary importance and all radiometric dates are evaluated against them.

because of its accuracy radioactive dating is also called-23because of its accuracy radioactive dating is also called-4

Here he can see that some curved sedimentary rocks have been cut vertically by a sheet of volcanic rock called a dyke.

Radiometric dating, often called radioactive dating, is a technique used to determine the age of materials such as rocks.

It is based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates.

It is the principal source of information about the absolute age of rocks and other geological features, including the age of the Earth itself, and it can be used to date a wide range of natural and man-made materials.

The best-known radiometric dating techniques include radiocarbon dating, potassium-argon dating, and uranium-lead dating.

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