why do we study the andes mountains
About the Andes Mountains. The Andes Mountains run the length of the West Coast of South America, rising in the North in Colombia and finishing in Chile and Argentina in the South. They are world's longest mountain range running for over 7,000km and covering 6 countries.his has created a sequence of volcanoes and fold mountains, rising up to 6962m at Aconcagua. The trench (marking the boundary between the Nazca and South American plates) to the West of the Andes mountains is called the Peru-Chile Trench, and reaches an incredible depth of 8066m under the sea level.