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  3. The ocean covers three quarters of the earth’s surface, produces 90 percent of all its life-supporting oxygen, and is the drivin

The ocean covers three quarters of the earth’s surface, produces 90 percent of all its life-supporting oxygen, and is the drivin

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问题    The ocean covers three quarters of the earth’s surface, produces 90 percent of all its life-supporting oxygen, and is the driving force behind the entire weather system. There are over 450 million cubic miles of sea water on the earth: and each cubic mile contains over 150 million tons of minerals. The oceans contribute immeasurably to the earth’s life support system as well as provide an untapped storehouse of food, minerals, energy, and archaeological treasure.
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答案 海洋占地球表面四分之三。地球上维持生命的氧气，90％产生于海洋，整个天气系统变化的动力也是海洋。地球上的海水超过4亿5千万立方英里，每立方英里含有的矿物超过1亿5千万吨。海洋对地球上的生命维持系统做出了不可估量的贡献，同时又是一座尚未打开的宝库，储有食物、矿物、能源和具有很大考古价值的宝藏。
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