Transform
A transform plate boundary isn't what it sounds like.
Transform plate boundaries are where the lithospheric
plates slide past one another along vertical fractures
experiencing shear stress (Oskin). These fractures are
called faults, and when the plates move parallel on either
side we call them strike-slip faults. We call them
transform faults because this lateral movement
"transforms" into a fault that has different motions along
the same fault plane. Transform plate boundaries may
connect converging or diverging plate boundaries. In fact, one of the
causes of transform plate boundaries is thought to be
divergent plate boundaries. When divergent plate
boundaries have a slightly curved line, the tectonic
forces will break the curved part of the boundary into a
series of pieces ("Types of
Plate Boundaries"). Transform plate boundaries form
parallel to the spreading direction between the segments.