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18 February, 19:54

Why would life on earth be unlikely to survive if the liquid iron core did not produce a magnetic field?

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  1. 18 February, 23:01
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    Based on its density alone, Venus must have an iron-rich core that's at least partly molten - so why does it lack the kind of global magnetic field that Earth has? To generate a field, the liquid core needs to be in motion, and for a long time theorists suspected that the planet's glacially slow 243-day spin was inhibiting the necessary
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