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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 ...

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…

The Great 1906 San Francisco Earthquake

Among the worst natural disasters in U.S. history by Chris Frantz San Francisco, California, April 1906 Related Links Almanac: San Francisco San Francisco Census Facts:…

Origin of Life: Early Earth Environment

Early Earth EnvironmentOrigin of LifeIntroductionSpontaneous GenerationEarly Earth Environment So if Pasteur is correct and life only comes from existing life, where and how …