The Mid-Ocean Ridge
If you could see the ocean floor, you would see the same things you see above water. There are hills and valleys on the ocean floor. There are tall mountains too. As a matter of fact, the longest mountain ridge on Earth is almost all beneath the ocean. A mountain ridge is a group of mountains. The longest one is called the mid-ocean ridge. It is more than 40,000 miles long. There are also thousands of volcanoes in the ridge. Many of the volcanoes and mountains under the water are taller than any of the mountains that we see on land. Even though the mountains are very tall, you won’t see most of them from land. That’s because most of this mountain ridge is very deep under water. It crisscrosses Earth along the oceans’ floors. The ocean floor is a very beautiful place. Scientists need special equipment to see the ridge.
1. Which supporting sentence best fits at the end of the passage?