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Listen to native speakers pronounce “outer core” in real conversational contexts with synchronized timestamps and subtitles.
That didn’t fit with the dominant idea of a gooey, liquid core.So, in 1936, Lehmann published a paper theorizing that Earth’s center consisted of two parts: a liquid outer core surrounding a solid inner core.Lehmann passed away in 1993 at the age of 104, living long enough to see her theory about the Earth’s core become widely accepted scientific consensus.