Question

how to prove earth is a magnet

Answer 1

Earth contains a north and a south pole. to find out if the earth is magnetic, then se  on the compass

Answer 2

earth attracts all objects in its field so the magnet does. so it is no wrong to say that earth is a magnet because it also attract with a pull force like the magnet. earth acts as a ball of magnet which attracts things towards centre

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