Question

why does a transform fault cause earthquakes, but not volcanoes?
because the plates do not touch each other
because of steam buildup in the lava
because the magma is rich in basalt
because the plates move past each other

Explanation:

In a transform - fault boundary, tectonic plates slide horizontally past each other. Friction between the plates causes stress to build up. When the stress exceeds the strength of the rocks, it is released suddenly as an earthquake. There is no significant up - welling of magma (which is required for volcanic activity) as the plates are just moving laterally relative to each other.

Answer:

Because the plates move past each other