I have actually never understood why earth"s inner main point is solid. Because the inner main point is do of one iron-nickel alloy (melting point around 1350 C come 1600 C) and also the temperature that the inner main point is around 5430 C (about the temperature of the surface of the sun). Because Earth"s core is nearly 3-4 time the melting point of iron-nickel alloys how can it possibly be solid?


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Earth"s inner main point is solid also though the temperature is therefore high because the press is also an extremely high. Follow to the Wikipedia write-up on the Earth"s within core, the temperature in ~ the facility is $5,700 extK$ and also the pressure is estimated to it is in $330$ to $360 extGPa$ ($sim3cdot10^6 extatm$).

The phase diagram shown listed below (taken native this paper) reflects the liquid/solid transition, wherein fcc and also hcp space two various crystalline creates of hard iron. You have the right to see plainly from the slope of the heat going off toward the upper appropriate that iron need to be solid in ~ this temperature and also pressure.

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In addition to the answers below and my comment above, I believe the complying with phase diagram, indigenous DavePhd"s price here, sourced from here, is an ext appropriate because that the pressure levels close to the Earth"s main point of about 330 come 360GPa.

We have the right to see from the picture that because that pressures between 330 and also 360GPa, the melt temperature ranges from around 6200 K to 6600 K, i beg your pardon is much greater than Earth"s inner core temperature of about 5700 K.

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You are only considering the melting allude at atmospheric pressure. Melting suggest depends upon pressure. The press in Earth"s main point is about 350 GigaPascals. The is essential to examine the phase diagram of the substance gift considered. A step diagram explains what phase (solid, liquid, gas) a problem is in at various temperatures and pressures.

See step diagram the iron, revised-core temperatures for comprehensive information.


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