Question

why earth behaves like a magnet?What is the reason behind I
t?

Answer 1

The earth is itself a magnet.its and electromagnet.

Deep in the Earth, molten metal (mostly iron) flows due to heat which causes convection. (The heat appears to be generated by iron condensing at the solid core.) This flow tends to organize itself into patterns, just like the patterns you’ll see in oil if you heat it in a frying pan. Such patterns in a flowing conductor tend to create magnetism

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Answer 2

Because earth is depend on gravitational force which function exactly like magnet. They have north and south poles. The motion of ions and electrons produce an electric current through the earth's core. The rotation of the earth's core like a disc produces the earth's magnetic field

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