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This challenge is mainly headed by Creationism which teaches a young-earth (YE) theory.

A young earth is considered to be typically just 6,000 years old since this fits the creation account and some dating deductions from Genesis.

And OE Christians (theistic evolutionists) see no problem with this dating whilst still accepting biblical creation, see Radiometric Dating - A Christian Perspective.

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the carbon isotope C-14 decays to nitrogen-14 and the uranium isotope U-235 decays to the lead isotope Pb-207.

One early approach was based upon ocean salinity [John Joly, 1800's].

This assumed the ocean was initially pure water and that it's salinity was derived from continental erosion.

One problem with earth dating is that the original earth surface is assumed to have eroded long ago.

But assuming the earth was formed at the time of the rest of our solar system, then recovered moon rock and meteorites can also be used to estimate the age of the earth.

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