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The collision between the Nazca and South American tectonic plates is primarily caused by the movement of the Nazca Plate, which is an oceanic plate located off the western coast of South America. As the Nazca Plate moves eastward, it is subducting beneath the continental South American Plate due to their differing densities, with the denser oceanic plate sinking into the mantle. This tectonic interaction results in significant geological activity, such as the formation of the Andes Mountains and frequent earthquakes in the region. The ongoing plate movements are driven by mantle convection and the Earth's tectonic processes.

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1w ago

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