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沙尘暴的形成原因英语
Sand-dust storm is a weather event mainly occurred in the arid and semi-arid regions of the world,which is caused by the sand and dust blown into the atmosphere by strong wind.After its occurrence,the...
一篇关于沙尘暴的英语文章作文
At first glance, dust storms do not seem very fascinating. Winds pick up fine particles from the ground, and then the air becomes thick with dust. What is interesting, though, is that dust storms can travel across the ocean, sometimes from continent to continent. Such dust storms are worth investigating.
In April of this year, a dust storm that originated in China and Mongolia took a six-day journey across more than ten thousand kilometers of sea and open land to Arizona in the United States. The cloud was so dense that it seemed as if the sun were setting early. At least one person thought a volcano had erupted.
Although traveling dust storms are nothing new, the dust now often contains chemical or metallic substances that contribute to respiratory illnesses and damage the environment. At present, a group of researchers in Asia is studying aerosol particles and their effects on the environment—and they have plenty of dust to work with.
Dust storms are one of the repercussions of humans messing around with Mother Nature. Although they are a natural phenomenon, dust storms have been occurring more often, at shorter intervals, and with greater force in recent years, and human activity is the cause.
It is a fact that excessive herding of animals and exploitation of grasslands are responsible for the majority of dust storms. This means that dust storms are largely a result of human actions; in other words, they are controllable.
We seem to think, however, that economic development and preservation of the environment cannot go hand in hand. For most countries, economic development comes first, at the expense of the environment. It is high time everyone came to grips with the consequences of overusing the earth's resources, including the misuse of land in the pursuit of economic wealth.
乍看之下，沙尘暴似乎不怎么引人注意。地面的细沙被风卷起，空气中便充满厚厚的灰尘。但有趣的是，沙尘暴能穿洋渡海，有时还能横越大洲。这样的沙尘暴值得我们去好好研究一下。
今年四月，源自中国大陆及蒙古内陆的沙尘暴，在六天中跨越了一万多公里的海洋与空旷陆地，最后到达美国亚利桑那州。阴云密布，就象太阳将提早要下山，有人居然以为是火山爆发了。
虽然移动的沙尘暴没什么稀奇，但现在那些沙尘通常含有引起呼吸道疾病和破坏环境的化学或金属物质。现在亚洲有一批研究人员正在研究悬浮颗粒及其对环境的影响——他们要研究的沙尘可多着呢!
沙尘暴就是人类任意破坏大自然，所造成的影响之一。沙尘暴虽是自然现象，但是近年来发生的频率却逐渐增加，间隔的时间也愈来愈短，破坏力更强大了，人的活动是罪魁祸首。
事实上，沙尘暴形成的主要原因是过度放牧及滥垦草原，这表明沙尘暴大多是人的活动所导致，也就是说，它们是可加以控制的。
不过，我们似乎认为经济发展与环境保护无法同时兼顾。对大部分国家来说，经济发展是第一位的，为此可以不惜牺牲环境。然而，我们已过度使用了地球的资源，包括为了追求经济繁荣而滥用的土地，如今该是我们认真面对这个后果的时候了。
造成沙尘暴的原因英语作文
沙漠、飓风与扩散
-----洪为民
中国现有沙化荒地占国土面积的18％，相当于43个台湾省的面积。目前流沙已经逼近北京城的郊外70公里处，沙尘暴的频繁发生，严重危害着人们的安全。为了向沙漠要黄金，整治,开发利用沙漠，我们首先要对沙漠有客观的了解。
一， 沙漠的产生
沙漠并非地球出生时固有的，而是干旱的沙土堆积而成的。沙漠是可以治理的。
干旱的沙土来源是多方面的。由于大陆板块漂移，使青藏高原不断上升，一些海底变成了陆地，盆地式的海底之沙，是新疆沙漠的特点。由于盐碱过多，植物太少，干枯后就成了沙漠。这些沙漠地区里多有石油，盐矿和碱矿。
有的沙土是由于火山灰堆积而成，由于缺水，干旱变成了沙漠。这是肥沃土壤的沙漠。由于大风吹袭，表层留下粗沙。而下面有肥沃的土壤，可开发成果园。有些草原森林被野火烧毁，又加干旱，再被大风吹刮，也变成了荒漠。美国有许多荒原沙漠都已经开发成种植园了。
有的沙土是石头风化，地震而形成的，有的沙里含石英很多，是制造玻璃的原料。
有的沙土是电离分化瓦解出来的，往往含铜，含金。美国内华达的阿泊基金矿就是在沙漠荒野里开采出来的。
二， 黎明前的飓风
在沙漠里常常有黎明前的飓风，这种风是由西向东刮。这是由于当东边干燥无云的情况下，太阳一照，马上升温。气流往上去，西边的冷空气就向东流去，引起阵阵飓风。沙漠上没有植物的阻挡，风沙与大地的磨擦力很大，沙丘便沿着大风的方向往东方移动。这种风不在沙漠里有时也会发生，但不会有沙漠地那么大的灾害。
中国的沙漠，也是在往东南方移动。不仅是西北风的关系，还有地形的关系。由于黄土高原，内蒙古高原的地势高，所以冷空气南下的时候，就把沙漠推下来。地理条件也是沙漠东移的一个原因。
沙漠风暴的特点是：风力强，风里夹杂着沙土，因此对地面的磨擦力相当大。因为没有植物阻挡，土地干旱，沙土就很容易被风卷走。因此沙尘暴多发生在干旱的季节。
三， 沙漠扩散原理
前面分析了沙漠的起源，然而沙漠还会不断扩散。如同癌细胞一样，会把好好的草原变成沙漠，会把森林变成沙漠，会把田野变成沙漠。流沙经过的地方就成了荒野。
沙漠里的沙，按大小可以分成三类：
细沙土，最易被西北风卷走，飘得很远。这是沙尘暴的主要成分。
中沙可被风吹动，但是不能带到高空。这是沙丘和流沙的主要成分。这是沙漠扩散的主力。流沙可变良田为沙漠。因此，治理沙漠一定要固定住流沙。
粗沙石砾是风带不动的，就留在荒野里。这是沙漠的后备力量，它们不断风化，形成细沙和中沙补充沙漠。所以治理沙漠一定要治理荒漠，切断沙漠的后备来源。
本文由中华沙漠开发协会提供。
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沙尘暴是怎样形成的英语
Formation of dust storms are required to have 4 conditions.Dust on the ground substance. It is the material basis of the formation of dust and sandstorms.Is the second winds. This is the formation of sand-dust storm power base, is also capable of long distance transportation of dust storms power guaranteed.Three unstable air. It is an important local thermal conditions. Dust storms occur in the afternoon on the importance of end of thermal conditions in the evening.Four is an arid climate environment. Spring dust storms occur in the North, and rainfall does not occur over time after dust storms is a very good evidence.Spring desert of edge area, due to long-term drought, and surface rare vegetation cover, dang has Gale comes of when surface of dust is easy was blowing since and was lost moved, but due to sand grain diameter larger, easily formed hanging moved (suspended moved, is small particles substances guarantee long distance lost moved of necessary), therefore cannot long distance lost moved, this is from dust more far of area only dust and rare Yang Sha of main causes. If the wind continues for very long, formed of suspended dust can be transported far away, area will appear along the sand-dust storm; when the winds diminished to a certain extent, dusty land, dust appears on the weather. If rainfall at this time, it will form the so-called "mud and rain".From sandstorm formed process by needed of 4 a conditions see, loess plateau, and vast of desert and the by man-made factors of damage are is desert of process in the of land, North spring late farming of land and the is construction process in the of based facilities (as Expressway,) for sandstorm of occurs provides has full of substances source; and Spring North area of drought, also makes sandstorm occurs of possibilities enhanced; Gale of produced is a complex of atmospheric phenomenon, main is front activities or Jingwei to circulation adjustment role of results. Thus results both dust storm was a variety of complex factors, destruction of nature by human activities leading to increased land desertification, had a very important role on occurrence of dust storms, and in recent years the global drought (the reason for this is not yet known) abnormal weather phenomena such as also played an invaluable role in occurrence of dust storms. So said human activity only for sandstorms play a role and it cannot be said that dust storms are caused by human factors.
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