they forn earthquakes
Transform boundarys are also called strike-slip faults. The only transform boundry is in California.
The cause of Strike-Slip faults are the formation of transform boundarys. My soures: http://wiki.answers.com/Q/What_plate_boundary_causes_a_strike_slip_fault The answer: I am certain that the answer is the transform boundary. The only thing I don't quite know is what is the difference from a boundary and a fault but I am 100% certain that the answer to your question is the transform boundary.
A compressional bounday is plate boundarys that are being compressed
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convergent boundaries collide but divergent boundaries move away from each other.
convergent