What is the difference between the theory of continental drift and the theory of plate tectonics? Your answer should include at least three complete sentences.
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Continental drift is to plate tectonics:

what the old concept of atoms as tiny solar systems is to the modern view of atoms.Or what Darwin’s vision of evolution was to the modern viewA Model-T Ford to a modern carA Wright Flyer to a modern jetlinerThe Army of the Potomac to the modern U.S. ArmyIn other words, an early prototype.

Wegener successfully reassembled the continents, and made remarkably astute estimates of when they separated and how they moved, but he had no data on the oceans. The theory was called “continental drift” because the central element was the movements of the continents. Besides, we live on the continents, so they must be the important parts, right? Several things happened to change that.

World War II saw the development of sonar and sensitive magnetometers for probing the oceans, in this case, looking for submarines. Geoscientists like Harry Hess spent the war salivating over what they could do with this gear once the war was over.Studies of earth’s magnetic field led to the discovery that the apparent positions of the poles had changed (actually the continents moved) and that the field underwent occasional reversals.The Worldwide Standardized Seismic Network, originally developed for monitoring nuclear tests, showed that earthquakes were highly localized in narrow zones surrounding relatively aseismic regions, called “plates.” The continents are generally within the plates. All the action is in the oceans. The continents merely ride passively.

Since the plates, not the continents, are the active elements, we now call the theory “plate tectonics.”

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The theory of continental drift suggests that all the land masses on earth were once part of one supercontinent. Plate tectonics is the ability to measure the movement of land masses.

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