San Andreas fault...
San Andreas Fault, geological fault zone in
California stretching northwest for 1000 km (600 mi), from the Imperial Valley
in southern California to Point Arena on the Northern Coast and out to sea. The
zone marks the boundary between the North American and Pacific tectonic plates.
Earthquakes occur along it because of obstacles to the steady, even movement of
the two plates as they slide past each other.Violent earthquakes and and volcanoes occur in these plate boundaries.
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