plate tectonics



Plate tectonics: Map of the world showing major plates and plate boundaries


Plate tectonics: Schematic model of the oceanic crust, showing the three types of plate boundaries

plate tectonics, theory that unifies many of the features and characteristics of continental drift and seafloor spreading into a coherent model and has revolutionized geologists' understanding of continents, ocean basins, mountains, and earth history.

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