Final answer:
At the San Andreas Fault, shearing stress is most likely to occur due to the movement of the Pacific and North American plates in opposite directions.
Explanation:
A transform boundary is where tectonic plates slide past each other horizontally. At the San Andreas Fault, the Pacific Plate is moving to the north and west, while the North American Plate is moving to the south and east. This movement creates shearing stress at the boundary, as the plates move in opposite directions.
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