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1. very geology centre Earth. of of The the


2. was believed It had our core. one planet


3. has a kilometres. It around of radius 3,485


4. second There's below deep core our feet. a


5. core. of the possibility showed Calculations second a


6. Earth's so core Why she the found intriguing.


7. part The of is mantle largest the Earth .


8. Using as probe a earthquakes to deep way .


9. planet It heat much how affects retains. the


10. over materials are How cycled Earth's time. the