The oceans of the Earth are all connected. They are truly one "world ocean" which covers about 71 percent of the Earth's surface. The salt water which flows from one part of the ocean to another without hindrance makes up 97 percent of the planet's water supply.Geographers, for many years, divided the world ocean into four parts: the Atlantic, Pacific, Indian, and Arctic Oceans. In addition to these oceans, they also described many other smaller bodies of salt water including seas, bays, and estuaries. Читать дальше...