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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.
Plate tectonics theory is taught in science classrooms around the world, but just 50 years ago it was a hotly contested theory. The idea that the Earthâs crust is made up of huge tectonic plates that are floating on an ocean of molten hot magma seemed too fantastic to be believed.he Theory of Plate Tectonics. The basic theory of plate tectonics is that along seafloor spreading zones, the continents are separating from one another. As they spread apart, magma comes to the surface and becomes new continental crust.