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  3. The ocean covers three quarters of the earth’s surface, produces 90 percent of a

The ocean covers three quarters of the earth’s surface, produces 90 percent of a

游客2023-10-12  47
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.So vast and so pervasive is the sea that if the earth’s crust were made level, ocean water would form a blanket over 8,000 feet deep.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.The deep sea is the last frontier left to explore.
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答案 海洋覆盖地球表面的四分之三,地球上维持生命的氧气90%来自海洋,整个天气系统变化的动力也是海洋。地球上海水超过四亿五千万立方英里,每立方英里含有的矿物质超过一亿五千万吨。海洋如此广大浩瀚,分布如此辽阔,如果使地球表层平整起来,那么海水可以形成深八千多英尺的覆盖层。海洋对地球的生命维持系统做出了不可估量的贡献，同时又是一座尚未开发的仓库， 储有食物、矿物、能源和文物宝藏。深邃的海洋是尚待探索的最后一个领域。
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