Inner region of the Earth's core. It is thought to be solid iron and nickel with a density of about 13 grams per cubic centimeter. It also has a diameter of about 1220 kilometers.

The central part of Earth's core, believed to be solid, and composed mainly of nickel and iron.

a solid ball inside the middle of the earth; 1540 miles thick; intense pressure keeps the inner core solid despite a temperature of 3700 degrees C

Central solid region of the Earth's core, probably mostly iron; radius about 1221 kilometers, discovered by Inge Lehmann in 1936.

solid innermost layer of Earth; composed of iron and nickel under extremely high pressure and temperature

generally made from high-density fiberboard (HDF), particle board, or plastic the inner core adds impact resistance and forms the interlocking tongue and groove system. Melamine plastic resins are also impregnated in the core to improve the moisture resistance of the inner core.

The inner core is a primarily solid sphere about 1220 km in radius situated at Earth's center.