Hamilton, Brian; Macmillan, Susan. 2011 Modelling the world's magnetism. Planet Earth, Spring.
Abstract
People have been finding their way with compasses for many centuries, but the Earth's magnetism is a more complex business, and in most places a compass doesn't point exactly towards the North Pole. Brian Hamilton and Susan Macmillan explain how understanding our planet's changing magnetic field helps keep us facing the right direction.
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