On its face, this fact is simple: our planet's magnetic poles have traded places with some frequency over Earth's history. At points in the past, compass needles would point south instead of north. But look into the details of these transitions and things will get considerably more complicated. What exactly is it like during the times when the poles flip, for example? And what is it about the "geodynamo" of Earth's liquid iron outer core that causes this behavior?

NEWS SOURCE :- https://arstechnica.com/science/2019/08/the-last-magnetic-pole-flip-saw-22000-years-of-weirdness/

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