|The ocean forms one great connected body of water often 'called the world ocean or the global ocean. The continents divide the world ocean into five major parts. They are the Pacific ocean, the Atlantic ocean, the Indian ocean, the Southern ocean and the Arctic ocean. Each ocean includes smaller bodies of water called seas, gulfs or bays which lie along the ocean margins. The world ocean contains about 97% of all the water on Earth. Most of the remaining water occurs frojen in ice sheets and other ice formation. The rest is under ground, in the air or in bodies of water as lakes and rivers. Life on earth began in the ocean according to most scien-tists and an incredible variety of living things resides in the ocean. Marine life ranges in size from microscopic one called organisms to the blue whale, which may measure upto 30 meters long. In a process called photosynthesis, ocean plants and plantlike animals use sunlight, carbondioxide, water and nutrients to produce their own food and materi-als for growth. Sea animals eat these organisms and one another. This book tells much about the oceans of our Earth and a good number of facts about them in an easy and lucid lan-guage useful and interesting for all those who wish to know something and more about the oceans. It is fully illustrated.