The magnetic field of the Earth is due to the metallic and liquid outer core of the planet around 3,000 km below our feet. It creates electric currents that generate and change our electromagnetic field. The outer core of the planet and the rotation of the Earth creates movements inside the liquid outer core which gives rise to the geomagnetics field. The Earth magnetic field [ the geomagnetic field] is the magnetic field that extends from the Earth's interior out into space exerting a force on the charged particles emanating from the sun.
The Northern lights in the Polar regions are also caused by the magnetic field of the Earth. Into the a comet like shape with a tail of magnetism that stretches millions of miles behind the Earth opposite from the Sun. The Earth magnetic field towards the poles where they interact with the atmosphere.A compass works the way because of the Earth's magnetic field.
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