Here's why:

* Transform boundaries are where two tectonic plates slide past each other horizontally.

* This sliding motion creates friction between the plates.

* The friction generates shearing forces, which are forces that act parallel to the surface of the plates, causing them to grind against each other.

Examples of the effects of shearing forces at transform boundaries:

* Earthquakes: The sudden release of built-up shearing stress along the fault line causes earthquakes.

* Offsetting features: The sliding motion can cause features like mountain ranges, valleys, and riverbeds to be offset along the boundary.

* Volcanic activity: While less common than at convergent boundaries, transform boundaries can sometimes experience volcanic activity due to the release of heat and pressure from the friction.

It's important to note that transform boundaries are generally not associated with the creation or destruction of crust. They primarily involve the lateral movement of existing plates.