Magnetism is an invisible force that can push and pull objects without even touching them. It works through air and water and even through solid objects. Not all materials are attracted to magnets. Only certain items, mainly made of metals, are magnetic. Magnetism has many uses. Compasses help people find their way. Many animals use magnetism to migrate great distances. Large magnets can sort metals for recycling, and some trains use magnetism to move. Magnetism is also behind the beautiful displays of light that sometimes glow near the North and South Poles.
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