A Lodestone is a naturally occurring rock with magnetic properties. All magnets create a "magnetic field" as shone to the right.
Earth's magnetic field protects us from harmful radiation cast by the sun's rays. It is also the interaction of the sun's rays and the magnetic field that creates auroras, or also known as the Northern Lights.
Because of the Earth's Magnetic Field, Man Created the Compass - which will always point North, toward the Earth's strongest magnetic pull!