wrote her letters in a colloquial style / the broken syntax and casual enunciation of conversational English Similar: informal (used of spoken and written language)
Best Answer: The mid-oceanic ridge can be described as the longest mountain range. It includes the Mid-Atlantic ridge, and all other such ridges. They form a complete system that is 65000 km long. The Mariana's Trench is the deepest. It's 11.03 kilometres deep. I don't know how you define underwater mountain.
If you are asking about the largest/longest mountain range in the world, that would be the Andes (complete: Cordillera de los Andes), which stretches the whole length of the western coast of South America.or the highest mountain range, that would be the Himalayas, which is located in Asia (of course, Mt. Everest is located here).