Final answer:
The Andes mountain range runs north to south along the west coast of South America and is the longest mountain chain on Earth and the highest in the Americas.
Step-by-step explanation:
The mountain range that runs north to south along the west coast of South America is the Andes, which is the longest mountain chain on Earth and the highest in the Americas. It stretches along the entire western region of the continent from Venezuela to southern Chile. The Andes have more than 30 peaks that reach at least 20,000 feet in elevation, many of which are active volcanoes.