In fact, Earth's inner core appears to have another even more inner core within it. "Traditionally we've been taught the Earth has four main layers: the crust, the mantle, the outer core and the ...

The outer core is made of liquid iron and nickel. The inner core is made from solid iron and nickel. In this diagram, the red lines represent the edges of the tectonic plates that make up the ...

When an electric current passes through a metal wire, a magnetic field forms around that wire (see diagram at right ... from the surface of the solid inner core. Although it may seem ...