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.You see, the theory of evolution has so many problems that most people find evolution hard to accept, and I don't think many people are led to question their faith because of it.
This millions of years time scale is based on radiometric dating of fossil-bearing layers of rock.
This teaching of long ages for life on earth has led some Christians to question and even abandon their belief in the Bible, since a literal reading of Scripture is not consistent with the belief that life has existed on earth for millions of years.
other isotope pairs cover intermediate time periods between the spans for carbon 14 and uranium.
Some radiometric dating methods depend upon knowing the initial amount of the isotope subject to decay.
Radiometric dating is the method for establishing the age of objects by measuring the levels of radioisotopes in the sample. It decays to nitrogen 14 with a half life of 5730 years.
Carbon 14 is created by cosmic rays in the upper atmosphere.
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Not everyone believes that radioactive dating is accurate.
There are people out there who don't believe the earth is older then 10,000 years old claiming that there is no way that dinosaur fossils can be as old as they say they are.
According to the Bible, the creation week lasted seven literal days and occurred a few thousand years ago.