Word: geo
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Dates: during 1970-1979
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...theory was so unorthodox and tenuous that Hess cautiously called it "geopoetry." It was soon to become geo-fact. After studying Hess's work, a 24-year-old Cambridge University graduate student, Frederick J. Vine, proposed an ingenious test. The iron in the lava from the mid-ocean ridges, he suggested, should be imprinted with the direction of the earth's magnetic field prevailing at the time that the lava cooled off. But patterns in land rocks had already shown that the magnetic field has inexplicably reversed itself as many as 171 times in the past 76 million...