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This is perhaps the closest approach to an ideal dating system. Furthermore, since argon is an inert gas and doesn't combine naturally with other elements, it has no business being in a crystal lattice at all.

It can only be there if it formed by radioactive decay.

Carbon-14 dating can only be used to determine the age of something that was once alive.

As long as an organism is alive, the amount of C-14 in its cellular structure remains constant.

But when the organism dies, the amount of C-14 begins to decrease.

It can’t be used to determine the age of a moon rock or a meteorite.

For nonliving substances, scientists use other isotopes, such as potassium-40.

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