Watch the videos below. In these videos, you will see the structure of the ocean floor, and the intersection with the continents.. Write a brief review of these videos. Using the information in the videos, your text, and any other source, address these questions in your review: How are oceans formed? What are the major regions of the ocean bottom, from a shoreline to the shoreline on the opposite coast? What happens when oceans close? Describe oceanic subduction beneath the edge of a continent. What new features are formed?.