Before the early 1950s, scientists knew very little about the ocean floor structure. Though studying geology on land was cheaper and easier, the overall structure of the Earth could not be understood without knowledge of the structure and evolution of the seafloor.
In 1952, Tharp painstakingly aligned sounding profiles from Atlantis, acquired during 1946–1952, and one profile from the naval ship Stewart acquired in 1921. She created approximately six profiles stretching west to east across the North Atlantic. From these profiles, she examined the bathymetry of the northern sections of the Mid-Atlantic Ridge. Tharp identified an aligned, v-shaped structure running continuously through the axis of the ridge and believed that it might be a rift valley formed by the oceanic surface being pulled apart. Heezen was initially unconvinced as the idea would have supported continental drift, then a controversial theory. Many scientists, including Heezen, believed that continental drift was impossible at the time. Instead, for a time, he favored the Expanding Earth hypothesis, (now infamously) dismissing her explanation as “girl talk”. FOR MORE
