Here's why:
* Transform boundaries are where two plates slide past each other horizontally. This motion doesn't create the conditions necessary for magma to rise and erupt.
* Convergent boundaries (where plates collide) and divergent boundaries (where plates pull apart) are the two types of boundaries that produce volcanoes.
* Convergent boundaries can lead to subduction zones where one plate dives beneath the other, melting rock and creating magma.
* Divergent boundaries allow magma to rise to the surface through the gaps created by the plates moving apart.
While transform boundaries don't produce volcanoes, they can still be very active zones, causing earthquakes. The San Andreas Fault in California is a prime example of a transform boundary.
