Mountains that form when two continents collide are called fold mountains.

Here's why:

* Continental Collision: When two continental plates push against each other, they have similar densities and neither can subduct (slide) under the other. This causes the land to buckle and fold.

* Folding: The immense pressure from the collision forces the rock layers to bend and fold, creating the characteristic peaks and valleys of fold mountains.

* Examples: Some of the most famous fold mountains include the Himalayas, the Alps, and the Appalachian Mountains.

Let me know if you'd like to learn more about mountain formation!