Lying 5,000km beneath our feet, the core is beyond the reach of direct investigation
The scientists believe the Earth's inner core is composed of two partssee more
BBC News - Heart of Earth's inner core revealed
http://www.bbc.com/news/science-environment-31322817
美國和中國科學家提出地球內核新理論 - BBC Chinese
http://www.bbc.co.uk/zhongwen/trad/science/2015/02/150210_erath_core
Inner core - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Inner_core
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