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The planet's magnetic field is generated by the motion of molten iron flowing around a superhot, solid iron core.
地球内部的熔铁围绕其核心的超高温固体铁核流动，由此产生了地球磁场。
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The inner core, made of very pure, solid iron, rotates along with the outer core, dragging the Earth's magnetic field with them.
BBC: Earth's wobbles reveal deep secrets
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