BBC地平线系列:地心

ForcenturieswehavedreamtofreachingthecentreoftheEarth.Nowscientistsareuncoveringabizarreandalienworldthatlies4,000milesbeneathourfeet,unlikeanythingweknowonthesurface.Itisaplanetburiedwithintheplanetweknow,wherestormsragewithinaseaofwhite-hotmetalandagiantforestofcrystalsmakeupametalcorethesizeoftheMoon. 　　Horiz...