Earth's inner core, 地球內核

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 parts
see 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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