Answer:
The formation of the Andes Mountain Range.
Step-by-step explanation:
They are the result of the subduction of the Nazca plate under the South American plate. They were formed at the end of the Cretacic period, during the Mesozoic era.
The Andes Mountain range forms a continuous highland for over 7000 km, and goes through 7 countries, making them the largest continental mountain range in the world.