What earths features form the longest mountain ranges on earth?

The longest mountain ranges on Earth are formed by the collision of tectonic plates. When two tectonic plates collide, one plate is usually forced to move under the other, a process known as subduction. The subducting plate melts and rises, creating magma that can erupt to form volcanoes. If the collision is relatively slow, the magma may cool and solidify before it reaches the surface, creating large masses of rock. These masses of rock are called batholiths, and they can be hundreds of miles long and wide. The longest mountain ranges on Earth are formed when batholiths are uplifted by the collision of tectonic plates. The longest mountain range in the world is the Andes Mountains, which stretch along the western coast of South America for over 4,000 miles. The Andes Mountains were formed by the collision of the Nazca Plate with the South American Plate.