Which features form the longest mountain range on Earth? A. the mid-ocean ridges B. the deep-ocean trenches C. the Rockies D. the Andes

Answer: A. the mid-ocean ridges

Explanation:

The features that form the longest mountain range on Earth is the mid-ocean ridges and spans about 40,389 miles around the earth.

The mid-ocean ridge has about 90% of its system under the ocean. They are formed as a result of the movement of tectonic plates.