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No one is exactly sure how dense the core of the earth is. All we know is that the core is solid of an unknown density probably the density of a hard rock, and is denser than water for sure.

ans2. Studies of the behaviour of seismic waves have given us some ideas about the inner core. It is probably a nickel-iron mixture, with other heavy metal contamination. The heat due to radioactive decay has raised the temperature to 5700 deg C, but it is solid because of the pressure. Some of the temperature is due to gravitational pressure.

The inner core possibly rotates slightly faster then the lithosphere, though opinion is not agreed on this.

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