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San Andreas fault

(Encyclopedia) San Andreas fault, great fracture (see fault ) of the earth's crust in California. It is the principal fault of an intricate network of faults extending more than 600 mi (965 km) from NW ...

fault

(Encyclopedia) fault, in geology, fracture in the earth's crust in which the rock on one side of the fracture has measurable movement in relation to the rock on the other side. Faults on other planets and sat...

plate tectonics

(Encyclopedia) 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' ...

Continental Drift and Plate-Tectonics Theory

Source: U.S. Dept. of the Interior, Geological Survey According to the theory of continental drift, the world was made up of a single continent through most of geologic time. T…