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The Earth's Core contains a large iron crystal spinning differently to the rest of the Earth. But how could scientists ever work that out? In Our Time http://www.bbc.co.uk/programmes/b05s3gyv #earth
The Earth's Core contains a large iron crystal spinning differently to the rest of the Earth. But how could scientists ever work that out? In Our Time http://www.bbc.co.uk/programmes/b05s3gyv #earth