The tests used to determine whether brain stem death has occurred are outlined below: 1  A torch is shone into both eyes to see if they react to the light. 2  The cornea (transparent outer layer of the eye), which is usually very sensitive, is stroked with a tissue or piece of cotton wool to see if the eye reacts.
The inner core extends another 900 miles inward towards the center of the Earth. It is believed that this inner core is a solid ball of mostly iron, and nickel. The mantle is made of much denser, thicker material, because of this the plates float on it like oil floats on water.
Report Abuse. The Earthâs core is only partially molten. The outer core is composed of molten iron and nickel, and the inner core is solid. The inner core has grown at the expense of the outer core over the 4.5 billion years of the Earthâs history.ut there is still a lot of heat inside the earth, so part of that metal core is liquid because the heat is pushing the stuff apart even more than the pressure is pushing it together. It is only really really deep that the pressure part of the issue takes dominance and the metal core turns solid.