外がい核かく

noun

outer core

Geology term referring specifically to the liquid outer core of the Earth, often contrasted with 内核 (inner core).

See also: 内核

• 地ち球きゅうの外がい核かくは液えき体たいの鉄てつでできていると考かんがえられている。

  The Earth's outer core is thought to be made of liquid iron.