Final answer:
The Andes is the mountain range that runs north to south along the west coast of South America.
Step-by-step explanation:
The mountain range that runs north to south along the west coast of South America is the Andes. The Andes is the longest mountain range in the world and spans over 7,000 kilometers. It crosses seven countries, including Colombia, Ecuador, Peru, Bolivia, Argentina, Chile, and Venezuela.
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