A magnetic field is invisible, but it can be detected using a magnetic compass. A compass contains a small bar magnet on a pivot so that it can rotate. The compass needle points in the direction ...
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Migratory birds can use Earth's magnetic field like a GPSEurasian reed warblers (Acrocephalus scirpaceus) appear to calculate their geographical position by drawing data from different distances and angles between magnetic fields and the Earth’s shape.
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