An electromagnet is a magnet that is created by a current that flows around a soft-iron core.[18] Earth has a soft iron core surrounded by semi-liquid materials from the mantle that move in continuous currents around the core;[19] therefore, the earth is an electromagnet. This is referred to as the dynamo theory of Earth's magnetism.[20][21] The fact that Earth is an electromagnet helps it maintain an atmosphere suitable for life.
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