When an electric current passes through a metal wire, a magnetic field forms around that wire (see diagram at right ... and generators to operate. In the Earth (see image below right), the ...

The outer core is liquid iron and nickel and generates the Earth's magnetic field. And the inner core ... made from solid iron and nickel. In this diagram, the red lines represent the edges ...

Earth's core contains ... lines up with the magnetic field? The part of a compass that moves around to show the magnetic field is called the needle because you can make a simple compass out ...

Magnetotactic bacteria synthesize magnetic iron nanominerals, which function as tiny compasses that allow the microbes to navigate using Earth's geomagnetic field ... (top of the diagram) swim ...