It's these features that allowed the Danish geophysicist Inge Lehmann to make a major discovery in 1936. Seven years earlier, a large earthquake in New Zealand had led to a surprising seismic result: one type of body wave, which can travel through any material, had made it through the Earth – though they had been "bent" by some obstacle along the way. Meanwhile, another kind, known to be unable to traverse liquids, had not been able to pass. This overturned the long-standing belief that the core is entirely solid, and led to the modern theory there is a solid inner enveloped in a liquid outer layer – a sort of reverse coconut, if you will.

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