the young mountain ranges can be found the western part of the south american continent.They consist of high and complex mountain ranges which curve along the continent's western edge from Venezuela in the north to Tierra del Fuego in the south,forming the longest mountain system in the world. the main mountain range called the Andes is made up of smaller mountain ranges like Cordillera Occidental,Cordillera Oriental ,Cordillera central and Cordillera Real, with Cordillera Aconcagua as the highest peak(6,959 meters). These mountain ranges are the source of a lot of rivers in south America. they also act as natural walls,obstructing humidity and sea breeze from the West. This makes some areas in the continent hot and dry while the East is fully exposed to humidity from the sea