Rift Valley
A rift valley is a lowland region that forms where Earth's tectonic plates move apart, or rift. ...
Tectonic plates are huge, rocky slabs of Earth's lithosphere—its crust and upper mantle. ...
Many rift valleys are part of “triple junctions,” a type of divergent boundary where three tectonic plates meet at about 120° angles.
Answer:
The San Andreas Fault is a continental transform fault that extends roughly 1,200 kilometers (750 mi) through California. It forms the tectonic boundary between the Pacific Plate and the North American Plate, and its motion is right-lateral strike-slip (horizontal). ... It was formed by a transform boundary.