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Tweet from National Geographic (@NatGeo) - National Geographic (@NatGeo) Tweeted:
Earth's inner core is a roughly moon-size ball of iron floating within an ocean of molten metal—meaning it's free to turn independently from our planet’s large-scale spin https://t.co/tjHXgVun4L (https://twitter.com/NatGeo/status/1163485121586110467?s=17)

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