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Summary. The theory of continental drift was the first step toward plate tectonic theory, which became the foundation upon which modern geology is built. This module describes how the work of Alfred Wegener, Harry Hess, and others led to our understanding of plate tectonics. It explains plate tectonics as the driving force behind ongoing changes on Earth.
In the 1960's, however, geologists discovered that the ocean floors had been spreading, thus influencing the shapes and sizes of the continents. This new theory, called plate tectonics, provided a mechanism that made sense in physical terms to account for Wegener's idea of continental drift.lfred Wegener, who was educated to be a meteorologist and an Arctic climatologist, insisted that his theory was correct because of the evidence he saw. To support his ideas about continental drift, Wegener pointed to the similarities in the fossils of the southern continents.