https://www.popularmechanics.com/science/a65141200/seismic-waves-core-mantle-boundary/
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Something Strange Is Happening 1,700 Miles Beneath Your Feet. Now We Know Why. - Yahoo
6/24/25 at 1:00pm
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Popular Mechanics
Author
Elizabeth Rayne
25 words
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Earth’s innards are rumbling, and it’s not indigestion.
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