英語六級作文：Obtaining Fresh water from icebergs
在平平淡淡的學習、工作、生活中，大家都嘗試過寫作文吧，作文是從內(nèi)部言語向外部言語的過渡，即從經(jīng)過壓縮的簡要的、自己能明白的語言，向開展的、具有規(guī)范語法結(jié)構(gòu)的`、能為他人所理解的外部語言形式的轉(zhuǎn)化。怎么寫作文才能避免踩雷呢？下面是小編精心整理的英語六級作文：Obtaining Fresh water from icebergs，希望能夠幫助到大家。
the concept of obtaining fresh water from icebergs that are towed to populated areas and arid regions of the world was once treated as a joke more appropriate to cartoons than real life. but now it is being considered quite seriously by many nations, especially since scientists have warned that the human race will outgrow its fresh water supply faster than it runs out of food. glaciers are a possible source of fresh water that has been overlooked until recently. three-quarters of the earth＇s fresh water supply is still tied up in glacial ice, a reservoir of untapped fresh water so immense that it could sustain all the rivers of the world for 1,000 years.
floating on the oceans every year are 7,659 trillion metric tons of ice encased in 10000 icebergs that break away from the polar ice caps, more than ninety percent of them from antarctica. huge glaciers that stretch over the shallow continental shelf give birth to icebergs throughout the year. icebergs are not like sea ice, which is formed when the sea itself freezes, rather, they are formed entirely on land, breaking off when glaciers spread over the sea. as they drift away from the polar region, icebergs sometimes move mysteriously in a direction opposite to the wind, pulled by subsurface currents. because they melt more slowly than smaller pieces of ice, icebergs have been known to drift as far north as 35 degrees south of the equator in the atlantic ocean. to corral them and steer them to parts of the world where they are needed would not be too difficult. the difficulty arises in other technical matters, such as the prevention of rapid melting in warmer climates and the funneling of fresh water to shore in great volume. but even if the icebergs lost half of their volume in towing, the water they could provide would be far cheaper than that produced by desalinization, or removing salt from water。
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