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.
Best Answer: Hi Deidara, The layers of the Earth starting with the core of the Earth are the Inner core which is made of solid iron and nickel. That layer which is the inner most is solid and it is about 1300 km in diameter. Then there is the outer core which is made of liquid iron and nickel and it is about 2250 km thick. This would mean that this layer of the Earth is liquid. Then the next layer is the mantle.. The mantle is about 2800 to 3200 km thick and it is made of silicon, oxygen, iron and magnesium. Then finally the layer we live on is called the crust. The crust is about 10-70 km thick (average 32 km thick) and this layer contains oxygen, silicon and aluminum.