Final answer:
There are three types of plate collisions that form mountains: convergent boundaries, continent-continent collisions, and subduction zones.
Step-by-step explanation:
There are three types of plate collisions that form mountains: convergent boundaries, continent-continent collisions, and subduction zones. Convergent boundaries occur when two plates collide, causing one plate to subduct beneath the other. This is how mountain ranges like the Himalayas and the Andes are formed. Continent-continent collisions happen when two continental plates collide, pushing the crust upwards and creating mountains. The collision of the Indian and Eurasian plates that formed the Himalayas is an example of this. Subduction zones occur when an oceanic plate sinks beneath a continental plate, resulting in volcanic activity and the formation of mountain ranges, such as the Cascade Range in the US Pacific Northwest.