The document discusses the major bodies of water on Earth, including the four oceans (Pacific, Atlantic, Indian, Arctic) as well as the Southern Ocean. It notes that the Pacific is the largest and deepest ocean. The document also describes coral reefs, explaining that they form in shallow, warm seas and are made up of coral polyps' skeletons growing on top of old skeletons. Finally, it outlines the different ocean zones from the sunlight zone down to the sunless zone.