Thus, he concluded, if our Earth were older than 30,000 years the incoming water should just equal the water leaking out.Contrary to creationist Barnes' totally discredited claims, which I've covered in Topic 11, the earth's magnetic field (dipole moment) has, indeed, increased and decreased over time.Lingenfelter's paper was written in 1963, before the cycles of C-14 variation we described had been fully documented.Thus, the mere fact that the present rate of water coming in exceeds that of the water leaking out cannot be extrapolated back to a starting time.This nullifies the carbon-14 method as well as demonstrating that the earth is less than 10,000 years old.
We say that the input and output of water is in equilibrium.
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What the magnetic field does is to partially shield the earth from cosmic rays which produce carbon-14 high in the atmosphere.
The argument may be compared to filling a barrel which has numerous small holes in its sides.