Marie Tharp's map
December 9, 2014 5:12 PM Subscribe
How One Woman's Discovery Shook the Foundations of Geology "She crunched and re-crunched the numbers for weeks on end, double- and triple-checking her data. As she did, she became more convinced that the impossible was true: She was looking at evidence of a rift valley, a place where magma emerged from inside the earth, forming new crust and thrusting the land apart. If her calculations were right, the geosciences would never be the same."
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