Planetary Geology

How Do We Know That The Continents Move?

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These days, plate tectonics are a reality as sure as gravity. But when Alfred Wegner first suggested that the continents once fit together like puzzle pieces and had drifted over millions of years, he was ridiculed. Find out what made him come to his conclusions—and how other scientists eventually supported them—in the video below.

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Solving the Puzzle of Plate Tectonics

Plate Tectonics Explained

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