The longest mountain range in the world is the Andes that runs along the Western coast of South America. The range is over 7,000 km (4,300 mi) long and 200 km (120 mi) to 700 km (430 mi) wide.
The longest mountain range on Earth is called the mid-ocean ridge; it spans more than 40,000 miles around the globe, with about 90 percent of the mid-ocean ridge system under water. This system of mountains and valleys criss-crosses the globe, resembling the stitches in a baseball. If you look at a map of the world’s volcanoes, you’ll find that most of them form along its boundaries.
The longest mountain range on land is the Andes.
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