Question

the mid - ocean ridge
1 youve probably heard of the himalayas, the andes, the appalachian mountains, and the rocky mountains. after all, theyre impressive mountain ranges. but you might not have heard of the mid - ocean ridge system—despite the fact that it forms the most extensive chain of mountains on earth.
2 so, why isnt a mountain range this big more familiar? perhaps because more than ninety percent of the mountain range lies in the deep ocean. the massive mid - ocean ridge system wraps around the globe like seams on a baseball, stretching an impressive 65,000 kilometers. the majority of the
what is the main focus of the text?
what the mid - ocean ridge system is like
why the mid - ocean ridge system is more important than other mountain ranges
why people havent studied the mid - ocean ridge system

Explanation:

The text first mentions well - known mountain ranges like the Himalayas. Then it introduces the mid - ocean ridge system, stating it forms the most extensive mountain chain on Earth. It also explains why it's not as familiar (most of it is in the deep ocean) and describes its length. So the main focus is on what the mid - ocean ridge system is like. There is no comparison of importance with other mountain ranges in terms of significance (not just size) to support the second option. And there is no mention of people not studying it (the reason given is about its location, not lack of study) for the third option.

Answer:

what the mid - ocean ridge system is like