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The San Andreas Fault is a long crack in the Earth's crust that extends 970 km through California, in the USA. It runs along the edges of the tectonic plates carrying the Pacific Ocean and North America. These plates have shifted about 300 km over the past 15 million years. They continue to move about 6 cm each year, building up enormous stresses in the crust.

Along the fault line, the ground bulges, cracks open up and roads and railways develop a noticeable kink.

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Tags: earth, tectonic plates

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