Word: gondwana
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Dates: during 1940-1949
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...Science magazine, Dr. Alber Wolfson of Northwestern University advances his explanation: that they are led astray by the earth's fickle geology. According to a fairly well established theory, says Dr. Wolfson, the continents were once bunched together in two main masses: "Laurasia" (North America and Eurasia) and "Gondwana" (South America, Africa, Antarctica, Australia), which were separated only by shallow seas (see map). During the Cretaceous period, 60 million years ago, both masses broke up and drifted slowly apart, their light granitic rocks floating on the heavy, plastic basalt that underlies both the oceans and the land...