At the Earth s Core 地心记
earth s outer core 地球外核
earth ' s outer core 地球外核
以上来源于: WordNet
The Earth's core is important because it generates the planet's electromagnetic field - which seems to be weakening.
BBC: Planet Earth
Specifically, what the scientists have found is that the iron adopts a crystalline structure, like a diamond, in the Earth's core.
So clear are the steaming pools that to stare down into them is like staring down into a cave that leads to the earth's core.
FORBES: Magazine Article
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