The terms in bold link to topics in the AQA, Edexcel, OCR, WJEC and CCEA A-level specifications, as well as the IB, Pre-U and SQA exam specifications.
The North Poles defined by Earth’s rotation and by its magnetism both move around. This article discusses how Earth’s moment of inertia affects its rotation, and how its magnetic field varies in position and over time.
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