read the text and do the tasks that follow there is only one .It is divided into five different parts:the pacific,atlantic,indian,antarctic,and arctic oceans . there are also many other smaller seas ,gulfs and bays which form part of them.altogether they cover 75 percent of the earth's surface .for centuries , people have been challenged by the mysteries that lie beneath the ocean . however , today's scientists have overcome many of the challenges of the depth by using modern devces
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