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The Andes mountains consist of two mountain ranges. The western range is more volcanic and the eastern range is mostly a series of folded mountains. These are parallel ranges and they are not that far apart. In Bolivia the ranges are quite pronounced as two walls of mountains with sediment build-up in between which derived from the fight between uplift and erosion. The land in between these two ranges is the altiplano, which is relatively flat and high. Very few streams cut through the altiplano which help to maintain it's flat shape. In any case, all this wonderful science of plate tectonics and erosion creates some amazing landforms and natural beauty!