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Continue to ChatEarth’s solid inner core formed about 1.3 billion years ago https://thestateindia.com/2020/08/24/earths-solid-inner-core-formed-about-1-3-billion-years-ago/
Earth’s solid inner core formed about 1.3 billion years ago https://thestateindia.com/2020/08/24/earths-solid-inner-core-formed-about-1-3-billion-years-ago/