Job 38:4"The earth’s decaying magnetic field continues to prove a headache for those who accept long ages. A recent paper estimated that the field could disappear in about 1,900 years given an observed decay rate of 9% since 1840.
The field points almost north-south—only 11.5° off—which is handy for navigation using a magnetic compass.
Creationists have shown that
it could not have been decaying for more than 10,000 years, or else its original strength would have been large enough to melt the earth.
Most geophysicists are wedded to the geodynamo model which says there is a self-sustaining electric generator in the earth’s core. Even though scientists have not produced a workable model to prove this, it’s now being suggested that a major impact event sometime in the past helped force magnesium into the core in such a way that it provided a power source for the so-called geodynamo.
There seems to be a lot of wishful thinking in this hypothetical scenario, but evolutionists require something like this since the decay rate data at face value point strongly to a young Earth." CMI