Why the Earth is a magnet and how its inner structure relates to its magnetic field.
Earth behaves like a magnet because the molten iron core of Earth interacts with the movement of electrons on the surface of the planet. Use a compass to determine the direction of the north and south magnetic poles with information from a math and science teacher in this free video science lesson. Courtesy of ehowgreen
Looks at Earth's magnetic field and its origin.
Reviews why Earth is a magnet and how the planet's inner structure relates to its magnetic field.