For centuries we have dreamt of reaching the centre of the Earth. Now scientists are uncovering a bizarre and alien world that lies 4,000 miles beneath our feet, unlike anything we know on the surface. It is a planet buried within the planet we know, where storms rage within a sea of white-hot metal and a giant forest of crystals make up a metal core the size of the Moon. Horiz... 想看更多的BBC地平线系列:地心 centuries dreamt reaching centre Earth. Now 相关BBC地平线系列:地心,请关注我们的网站:www.zccjhb.com
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