What tectonic structure is South America on?

South America in tectonic terms is regarded in parts.
1) The West of South America mainly consists of mountains.
(Well, for example Andes)
2) Eastern South America is divided into two parts:
a) Highlands.
(For example: Guiana Highlands or Brazilian Highlands)
b) Lowlands
(For example: Amazonian immutability or Orinoco Lowland)



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