Its one of these features

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"It's one of these features that pretty much occurs under a lot of people's feet, when they don't even realise it," says Stephen Marshak, professor emeritus in the Department of Geology at the University of Illinois. He explains that in the centre of any continent, whether you're in the United States, Siberia or Europe, if you drill down far enough you'll hit the two layers of rock involved in this mysterious geological anomaly.

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