Final answer:
When Earth's plates collide, they can form fold mountains as seen in the Alps and Himalayas, where the collision of continental plates caused the Earth's crust to buckle and form high mountain ranges.
Step-by-step explanation:
When Earth's plates collide into each other, they can form fold mountains. This geological process occurs when two continental masses move towards each other and collide under great pressure, causing the Earth's crust to buckle and fold. These folds of the Earth's crust can be pushed up to form mountains, which can reach heights of many kilometers. The Alps are an example of fold mountains, created by the collision between the African and Eurasian plates. Similarly, the Himalayas are a result of the Indian plate colliding with the Eurasian plate, pushing up the Earth and forming this iconic mountain range. The process of mountain building related to plate motions is a fundamental aspect of Earth's dynamic geology.