Geophysicists have been paying particular attention to the Earth's magnetic field history, pointing out that there was a point when it had become very weak causing massive implications to all life-forms inhabiting it. It might have actually lead to mass extinction events during that period in time. The whole Earth would have been completely wiped out if it weren't for some processes happening within the Earth's inner core.
(Image credit: Ryan Somma/Flickr)
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