Earth's Magnetic Field
Dr. Thomas G. Barnes has shown that the strength of the earth's magnetic field is decaying exponentially at a rate corresponding to a half-life of 1,400 years. That means 1,400 years ago the magnetic field of the earth was twice as strong as it is now. If we extrapolate back as far as 10,000 years, we find that the earth would have had a magnetic field as strong as that of a magnetic star! This is, of course, highly improbable, if not impossible.
Thus, based on the present decay rate of the earth's magnetic field, 10,000 years appears to be an upper limit for the age of the earth. The earth's magnetic field is believed to have been relatively stable, except for certain intervals when it went through a reversal, dying down to zero and rising up again with the reverse polarity. The last such reversal supposedly occurred about 700,000 years ago. How can this date be accurate when we consider the half-life of the magnetic field?
The earth's magnetic field is believed to be generated by the circulating electric currents in its core. If we extrapolate backward about 20,000 years, we find that the estimated heat produced by the currents would have melted the earth! You can draw your own conclusions as to whether or not the magnetic field proves a much younger earth than evolutionists claim. However, this is another piece of evidence that is omitted from most textbooks because it contradicts the evolutionary theory.
If you would like to read Dr. Barnes' complete article, contact the Institute for Creation Research http://www.icr.org
Thomas G. Barnes, Origin and Destiny of the Earth's Magnetic Field, Institute for Creation Research, Technical Monograph No. 4, San Diego, CA: Creation-Life Publishers, 1973, p.12.
Sylvia Baker, Bone of Contention: Is Evolution True? Evangelical Press, England, 1980, p. 33.
Scott M. Huse, The Collapse of Evolution, Grand Rapids, MI: Baker Book House, 1983, pp. 21-22.