The strength of the magnetic field has been reliably and continually measured since 1835. From these measurements, we can see that the field's strength has declined by about seven percent since then, giving a half-life of about 1,400 years. This means that in 1,400 years it will be one-half as strong, in 2,800 years it will be one-fourth as strong, and so on. There will be a time not many thousands of years distant when the field will be too small to perform as a viable shield for earth.
Calculating back into the past, the present measurements indicate that 1,400 years ago the field was twice as strong. It continues doubling each 1,400 years back, until about 10,000 years ago it would have been so strong the planet would have disintegrated--its metallic core would have separated from its mantle. The inescapable conclusion we can draw is that the earth must be fewer than 10,000 years old....
Magnetic field decay also involves a whole earth measurement, and on this large scale...
~Excerpts, John D.Morris, PhD, ICR
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