It produces earth's magnetic field.
the inner core is a solid
The Earth's rotation on its axis
Comparison of waves going through the solid inner core and those just skimming it can show the rotation of the inner core.
The proposed mechanism for the creation of Earth's (and other celestial bodies) is covered by the Dynamo Theory. See related link below.
the inner core is mainly made as a solid. its like the rest besides outer core.
The inner core is solid.
The inner core is solid
There are two parts of the core: Inner and Outer. The outer core is liquid, the inner solid. The inner core is solid due to the pressure exerted on it, despite the excessively high temperature.
inner core of what? the earth's inner core is in solid form if that's what you mean.
The inner core is solid.
In inner core is solid while the outer core is liquid. This is because the inner core, being deeper, is under more pressure.
The inner core is currently thought to be entirely solid.