Outer core

Japanese: 外核 - がいかく
Outer core
The outer part of the core that makes up the center of the Earth. It corresponds to the area between about 2,900 and 5,000 kilometers underground. It is mainly composed of iron, and also contains nickel, silicon, and sulfur, and is thought to be fluid.

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:
〘名〙 地球の中心部をつくる核の外側の部分。地下約二九〇〇~五〇〇〇キロメートルの間に相当する。鉄を主成分とし、ニッケル、ケイ素、硫黄をふくみ、流体的と考えられている。

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