napamuutokset
Napamuutokset, often translated as "polar shifts" or "pole shifts," refers to a geological phenomenon where the Earth's magnetic poles reverse their polarity. This is not to be confused with the geographic poles (North and South) which are the points around which the Earth rotates. Instead, napamuutokset involve the magnetic north pole becoming the magnetic south pole and vice versa.
Evidence for these reversals comes from paleomagnetism, the study of the Earth's past magnetic field. Rocks,
The Earth's magnetic field is generated by the movement of molten iron in the Earth's outer core,
While the exact mechanism and timing of future reversals are not precisely predictable, scientific consensus suggests