What is the meaning of Inner_core?

The solid material found in the centre of some planets at extremely high temperature and pressure, distinct from the liquid outer core.

  1. The innermost part of the Earth, believed to be made of a nickel-iron alloy.

The innermost part of the Earth, believed to be made of a nickel-iron alloy.

Used other than figuratively or idiomatically: see inner, core.

Source: wiktionary.org