What most people don't know is that the magnetic north pole is on the move about 40km south per year. The armed forces have to republish all their maps once a year to be close enough to up to date. 50,000 yeras ago the north magnetoic was south and the south north. It all depends how the massive core of magma that continents and oceans flot on are churning.
The top of the Earth doesn't change, its the imaginary axis the earth spins on every 24 hours.