Earth's magnetic field is generated in Earth's core where temperatures are so high that material with a high iron content is in a molten state, like lava. Due to Earth's rotation, the molten core is stirred up, sort of like what happens when you move a spoon around in a bowl of hot oatmeal. Not all parts of Earth's molten core move in the same direction nor at the same speed; there's friction between different segments, and that causes electricity which in turn generates a magnetic field.
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The earth has a molten iron core The Earth's magnetic field is generated in the fluid outer core by a self-exciting dynamo process. Electrical currents flowing in the slowly moving molten iron generate the magnetic field. In addition to sources in the Earth's core the magnetic field observable at the Earth's surface has sources in the crust and in the ionosphere and magnetosphere. The geomagnetic field varies on a range of scales and a description of these variations is now made, in the order low frequency to high frequency variations, in both the space and time domains. The final section describes how the Earth's magnetic field can be both a tool and a hazard to the modern world. First of all, however, methods of observing the magnetic field are described.
