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In what decade did she produce the first scientific map of the Atlantic Ocean floor?

1940s
1950s
1960s
1970s

Answer

In the 1950s, Marie Tharp produced the first scientific map of the Atlantic Ocean floor. The map was based on data collected by her colleague Bruce Heezen, who used sonar to map the sea floor. Tharp's map was a major breakthrough in oceanography, as it allowed scientists to see the structure of the ocean floor for the first time.