1 天前 · It likely took billions of years for the inner core to cool and solidify, and over the next few billion years, the inner core will continue to cool, sipping drops of liquid metal from the outer ...

20 小时之前 · Earth’s inner core is surrounded by an outer core, and the interface between the two, around 5,100 kilometres below the planet’s surface, is a mysterious realm. Previous seismic studies ...

1 天前 · Earth's inner core is undergoing structural transformation. Located 3,000 miles below the Earth's surface, the inner core is anchored by gravity within the molten liquid outer core. Until now the ...

Core can be a noun, verb, or adjective, but is most often used as a noun to refer to the central or most important part of something (“the core of the issue,” “the Earth’s core”) or to the usually inedible central part of a fruit (“an apple core”).

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The core of something such as a problem or an issue is the part of it that has to be understood or accepted before the whole thing can be understood or dealt with.