Central solid region of the Earth's core, probably mostly iron; radius about 1221 kilometers, discovered by Inge Lehmann in 1936.
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 center most portion of the earth
solid layer of the earth made of iron
The solid innermost part of the core with a diameter of a little over 1,200 km.