The Alps fold mountain belt was formed by the collision of the African Plate and the Eurasian Plate.

Here's a more detailed explanation:

* African Plate: This plate carries the African continent and is moving northward.

* Eurasian Plate: This plate carries Europe and Asia and is relatively stationary.

As these two plates collided, the continental crust buckled, folded, and uplifted, creating the towering peaks and valleys of the Alps.