eli5 – Why does Earth have a weak magnetic field and why is it weakening?
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From the geology 100 class I just took to my understanding. Earth magnetic field has a polarity normal and reverse. Now we know do to magnetism we find in millions of year old rocks that the Earth shifts polarity every now and again (it’s pretty inconsistent actually). Now we think we are in the middle of a polarity shift. Eventually the magnetism of the Earth will dissipate then shift polarity to reverse. Now we think this shift takes millions of years to accomplish so I wouldn’t really worry about it in any of our lifetimes but when we are in that moment that there is no magnetic field life will probably have a very hard time existing. So a polarity shift we think is happening rn so we’re coming from normal into reverse.
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