Picture a volcano. Now imagine that its main vent extends in a line. Now imagine that this line is so long that it runs for more than 40,000 miles through the dark recesses of all the world’s oceans, girding the globe like the seams of a baseball.
The results can make the visions of Jules Verne seem rather tame. A particular item is the relation suggested with historic ice ages.
“The suggested mechanisms might help explain how the planet’s regular ice ages end so abruptly — long a mystery.
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