Here's why:

* Vertical pressure: This refers to the force pushing down on the Earth's crust.

* Folding: When the pressure is intense enough, it causes the rock layers to bend and buckle, forming folds. These folds can be anticlines (upward arches) or synclines (downward troughs).

* Mountain formation: The uplifted portions of the folds, especially the anticlines, create mountain ranges.

Examples of fold mountains:

* The Himalayas

* The Alps

* The Appalachian Mountains

Let me know if you'd like more details about fold mountains!