Review the fourth and fifth paragraphs. The Mid-Ocean Ridge 1 You've probably heard of the Himalayas, the Andes the Appalachian Mountains, and the Rocky Mountains. After all, they're 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 i on Earth. 2 So, why isn't 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 How do the fourth and fifth paragraphs work together? They describe a theory and then acknowledge there are only two good examples. They describe a general phenomenon and then consider two examples. They present a hypothesis and then prove it with two conclusive examples.