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Andes Mountains
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Andes Mountains Article

How did the Andes Mountains form?

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About 250 million years ago, the crustal plates constituting Earth’s landmass were joined together into the supercontinent Pangaea. The breakup of Pangaea dispersed these plates outward, and the collision of two of these plates—the continental South American Plate and the oceanic Nazca Plate—gave rise to the mountain-building activity that produced the Andes Mountains.

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