Earth's magnetic field supports biblical stories of destruction of ancient cities
When battles raged in ancient cities, their rocks blazed so brightly that they could be reoriented according to Earth's magnetic field.
bigthink.com
So those who did O Level Physics, may recall that you can magnetise iron by heating it while holding it at about the angle of the Earth's magnetic field at the location of the iron.
With modern equipment, magnetism can be detected in mud bricks, so you can detect the date the city burnt from the magnetic field at the time the mud bricks were heated.