Ancient Rocks Hold Clues to How Earth Avoided a Mars-Like Fate

Ancient Rocks Hold Clues to How Earth Avoided a Mars-Like Fate

A depiction of Earth, first without an inner core; second, with an inner core beginning to grow, around 550 million years ago; third, with an outermost and innermost inner core, around 450 million years ago. University of Rochester researchers used paleomagnetism to determine these two key dates in the history of the inner core, which …

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