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On the west coast of South America the denser ballistic ocean crust of the pacific plate is pushed under the lighter granite continental crust of South America. This causes a subduction zone.By Donovan Lopez
The Andes mountains of South America and the Cascade Mountains of North America are some examples of a continental-oceanic plate boundaries.
Andes, convergence between South American Plate and Pacific Plate
The eastern coast of South America is a passive margin, rather than a plate boundary.
The Andes are formed by the collision of the Nazca Plate (oceanic) and the South American Plate (continental). The collision causes the continental crust to buckle and form fold mountains which are then peppered with volcanoes caused by melting of the Nazca plate as it is forced down into the Earth's mantle.
It is located about 75 km (47 miles) south of the city of Quito in Ecuador.
South America. About 400 miles of the coast of Argentina, however it is a dependency of the United Kingdom although Argentina disputes ownership. In continental plate terms, it is on the South American plate, but lies close to the boundary with the Scotia plate to the south
Subduction
Brazil is on the South American Plate.
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The North American Plate is a combination of continental and oceanic plates. North America itself is continental crust.