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- it's a sphere with a radius of about 1230 km

- it's made of iron

- it has a temperature of about 5500ºC (above melting point for iron), but is solid due to the pressure it is under

- it has a density of 13500 kg per cubic metre

- Seismic waves move through it faster from North to South than from equator to equator, suggesting an anisotropic quality

- computer simulations suggest that it is a single crystal of iron (Steinle-Neumann, Stixrude, Cohen - 2004)

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Q: Five facts about the inner core?
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