When Jules Verne wrote 'A Journey to the Centre of the Earth' over 150 years ago, he imagined a land of glowing crystals, turbulent seas, prehistoric animals and giant mushrooms.But what actually lies beneath our feet remains a mystery – even today we know more about the rings of than the interior of our planet.Over the past 30 years, however, our understanding of the Earth's inner core has expanded dramatically, and it has been shown to move and change over decades.
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