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A large part of the land relief is formed by large areas of flat terrain, the so-called plains. They can have some gentle elevations, such as hills, hills or other hills. The image shows one of the largest plains on the planet, the Pampeana region or the Pampa plain.
Although most of it is in Argentina, it also extends to other countries in South America, such as Bolivia, Brazil, Paraguay and Uruguay. The word Pampa itself, of Quechua origin, is used to designate any plain or plain without tree vegetation.
In the case of the Pampas of Argentina, that of the image, originated from a large South American continental massif. After fracturing, dislocating and sinking, the base was formed on which the posterior sediments were supported, giving rise to the crystalline basement of the Pampas plain.
A part of the Pampa sediments are composed of silt and fine silty sands that include a lot of calcium carbonate. These particles originated from the volcanic activity produced in the Andes Mountains. Some sediments were deposited by direct fall after eruptions. Another part did it by the action of wind or transported by water.
Today, the Pampas region is one of the most geologically stable areas on the planet, since there is hardly any friction between some peripheral and almost inactive minor faults of the Brasilia and Patagonia shields.