核心的半径约为3500公里，内核是固体的，半径约为1220公里，这使得这个内核略大于月球。
②Earth has an overall density of 5.5 grams per cubic centimeter, yet the average density of rocks at the surface is less than 3.0 grams per cubic centimeter.
地球的总密度为每立方厘米5.5克，但地表岩石的平均密度小于每立方厘米3.0 克。
③Support for the theory that the core is posed of iron (85 percent) with lesser amounts of nickel has e from the study of meteorites.
对陨石的研究支持了地核由铁（85%）和少量镍组成的理论。
④There is further evidence that Earth may have a metallic core.
进一步的证据表明地球可能有一个金属内核。
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