I have second thoughts, the inner core is made up of iron and nickel, it is the hottest layer of the Earth and it has a temp of 5500°c, but that's a solid layer, the outer core is just the same, but the mantle, its the widest section of the earth and has a diameter of 2900km, its made up semi molten rocks called magma. So lets say: The Earth is made up of iron, nickel and semi molten rock.But the crust is made up rocks upon which we live.
