Answer :
the san andreas fault in california stretches over 800 miles and is responsible for many of the earthquakes that happen in california. Transform plate boundry is the san andreas fault.
The Earth's crust is broken up into a number of "plates," which scientists have discovered have been moving very slowly over the surface of the planet for millions of years. In western California, two of these tectonic plates collide, and the San Andreas fault separates them. Along the fault, earthquakes occur as the Pacific Plate, which is on the west, shifts northwestward in relation to the North American Plate, which is on the east. The San Andreas is the "master" fault in a complex network of faults that rips through the rocks along the California coast. The length of the entire San Andreas fault system is more than 800 miles, and it penetrates the Earth at least 10 miles below the surface.The fault is a complicated zone of crushed and shattered rock that can range in width from a few hundred feet to a mile. From and into the San Andreas fault zone, numerous smaller faults diverge. Nearly every road cut in the region exhibits a variety of tiny cracks, fault gouge (rock that has been ground into powder), and a few distinct chunks of rock.
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