Eli5 The earth has a magnetic field, including because of the metal core, but magnets are demagnetized at high temperature. How is this possible
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The earth isn’t a permanent magnet
Permanent magnets exist because all the atoms have their own tiny magnetic field and all those magnetic fields are all aligned, they add up to one large field, and are destroyed by heat because it gives each particle enough energy to randomly jiggle out of alignment with other atoms, so that all the atomic magnets cancel out
The earth on the other hand is a dynamo, basically the liquid metals in the mantle and core are all flowing, and that flow creates an electrical charge, and moving electric charges creates a magnetic field like one giant electromagnetic.
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