The central portion of Earth below the mantle, beginning at a depth of about2, 900 kilometers(1, 800 miles) and probably consisting of iron and nickel. It is made up of a liquid outer core and a solid inner core.

• 地核地球的中心部分，地幔以下，开始于深为2，900公里（1，800英里）的地方，大概含有铁和镍。它由一个液体的外核和一个固体的内核组成