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When granite rock hardens, it freezes radioactive elements in place.The most common radioactive element in granite is Uranium-238.When a living thing dies, its radiocarbon loss (decay) is no longer balanced by intake, so its radiocarbon steadily decreases with a half-life of 5,730 years.
Plants take in carbon dioxide, incorporating in their tissues both carbon-14 (unstable) and normal carbon-12 (stable) in the same proportion as they occur in the atmosphere .
Carbon-14 then moves up the various food chains to enter animal tissueagain, in about the same ratio carbon-14 has with carbon-12 in the atmosphere.
Therefore, a radiocarbon year would not correspond to an actual year.
As explained in recent measurements show that the ratio of carbon-14 to carbon-12 has been building up in the atmosphere.
The samples were from a mile below the earth, which, according to inflated evolutionary years, were 1.5 billion years old.