on what basis we can say that earth is a huge magnet. and what are the causes of this magnetism???
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Why is the earth like a magnet?

Earth’s magnetic field is mostly caused by electric currents in the liquid outer core, which is composed of conductive, molten iron. Loops of currents in the constantly moving, liquid iron create magnetic fields.
From afar, the Earth looks like a big magnet with a north and south pole like any other magnet. (As described in Which Pole is North, the pole located up in northern Canada is really the magnetic south pole.) If we consider it like a magnet, how does it compare to a magnet you might hold in your hand?
As described in our article on Magnet Grades, we often describe the strength of a magnet in two different ways: the strength of the magnetic field around it (surface field, expressed in gauss) and the force it takes to remove a magnet from either a steel plate or another magnet

Earth’s magnetic field is mostly caused by electric currents in the liquid outer core, which is composed of conductive, molten iron. Loops of currents in the constantly moving, liquid iron create magnetic fields.
From afar, the Earth looks like a big magnet with a north and south pole like any other magnet. (As described in Which Pole is North, the pole located up in northern Canada is really the magnetic south pole.) If we consider it like a magnet, how does it compare to a magnet you might hold in your hand?
As described in our article on Magnet Grades, we often describe the strength of a magnet in two different ways: the strength of the magnetic field around it (surface field, expressed in gauss) and the force it takes to remove a magnet from either a steel plate or another magnet
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on the basis of force of gravity we can say that it is a magnet . one cause is the change in direction of compass needle . this is caused due the presence of molten metal inside the earth
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