The Alps, Himalayas, and Rocky Mountains are examples of fold mountains. Fold mountains are formed due to the collision of tectonic plates. When two plates collide, the pressure causes the edges to buckle and fold, creating mountains. The folding of the rock layers results in a series of ridges and valleys that form the mountain range. The Alps, Himalayas, and Rocky Mountains were formed due to the collision of the African and Eurasian plates, the Indian and Eurasian plates, and the North American and Pacific plates, respectively.