Mountains formed by blocks of crust moving along a fault are called fault-block mountains.

Here's how it works:

* Faults: These are fractures in the Earth's crust where rocks have moved past each other.

* Tensional Forces: When the Earth's crust is pulled apart, it creates tensional forces.

* Block Movement: These forces cause blocks of the Earth's crust to move up or down along the fault line.

* Uplifted Block: The block that moves upward creates a horst or a mountain.

* Depressed Block: The block that moves downward creates a graben or a valley.

Examples of Fault-Block Mountains:

* Sierra Nevada Mountains (California, USA)

* Wasatch Range (Utah, USA)

* Harz Mountains (Germany)

* Vosges Mountains (France)

Let me know if you'd like to know more about any of these mountains!