Unless the magnetic field of the earth defies the second law of thermodynamics, impossible is that the earth is billions of years old, for the reason alone (among many) that the magnetic field strength of the earth measured by modern instrumentation has decreased about 7% during the last 150 years, so at the time of Noah’s Flood, it was several times stronger than today (which aided human longevity by buffering harmful UV rays), but (supposedly) a billion years ago, millions of times stronger.
