现在已不是魏格纳或者哥伦布的时代了,人们都知道地球是圆的,而且从里到外可分为地壳、地幔和地核。近五十年来,人类已经征服了月球,并且将探空器发送到了太阳系的边缘,但是人类却还是无法了解从地下6300米深处直到地心那部分区域的存在物。我们只知道那里有岩石在不停缓慢运动,有一个铁水层,还有一个呈固态并且密集的铁质内核。 Now is not the era of Wigner or Columbus, people are aware that the Earth is round, and from the inside out can be divided into crust, mantle and the core. For nearly five decades mankind has conquered the moon and sent the spacecraft to the edge of the solar system, yet humans still can not understand the existence of the area from 6,300 meters underground to a portion of the Earth’s center. We only know there are rocks moving slowly, there is a layer of molten iron, there is a solid and dense iron core.