how does the earths outer core have magnetic properties if the

>>7991311
iron has magnetic properties within a large temperature range, not just when hot

>>7991317
curie point of nickel and iron is far below the temperature of the outer core.

so it doesnt add up how the earth is magnetic in the first place.

>>7991311
>what is a dynamo

>>7991311
Currents produce a magnetic field. Current is just the movement of electrons. So if you move a metal that's technically moving electrons. The earth's core is a giant spinning chunk of metal, thus there is a net current and a magnetic field is produced.

>>7991328
basically this

>>7991328
its not even a theory at this point. the temperature is way too hot for nickel and iron to be magnetic. there has to be a fluid that is rotating and magnetic.

>>7991336
>Currents produce a magnetic field.

how? the temperature is too hot for iron and nickel to be magnetic.

>>7991347
https://en.wikipedia.org/wiki/Electromagnet

>>7991347
too hot for them to act as -permanent- magnets, yes. What the other posters are saying, is that because of electric current, the core actually acts as an electromagnet.
Actually interesting, I never knew that.

>>7991371
>>7991374
im still running into the problem that the temperature of the outer core is too high for iron and nickel to produce a current.

>>7991400
Why? Heat can't prevent a current being produced from the flow of liquid iron around the inner core. It's literally just electrons moving and charged metal in the flow moving through that field producing a magnetic field.

They're moving, therefore the y generate a current.

>>7991430
>>7991434
can you generate a magnetic field by circulating lava?

>>7991454
Yes.

>>7991454
its convection
the contrast between inner molten moving metal and cool outer crust

>>7991400
go look up the lorentz force, the definition of charge, and how a Magneto Hydro Dynamic generator works.

>>7991495
>>7991469
i was searching to see if Ampère's circuital law applies to lava or very very hot things since thats how the magnetic field is generated according to official sources.