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沙尘暴的英语ppt下载

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2019-02-11 09:42:27
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沙尘暴的英语ppt

这是沙尘暴的英语ppt,包括了What is a sandstorm?Causes of Sandstorms,the sand wall stands,the sky is dark,tumbling and punching,colorful,The kind of the Sand duststorm,Popular places of dust storm,The effects of sandstorms,How to control dust storms等内容,欢迎点击下载。

沙尘暴的英语ppt是由红软PPT免费下载网推荐的一款课件PPT类型的PowerPoint.

Sandstorm Team member Sandstorm refers to the weather phenomenon that the strong wind will blow up dust on the ground to make the air very turbid and the visibility is less than 1km. Strong dust storms in mainland China mostly move from the northwest or the west, while a few move from the east. When almost all dust storms come, we can all see black sand walls moving rapidly and getting closer and closer in the direction where the wind blows. From a distance, the wind-sand wall is towering like a wall, and it is the vanguard of the dust storm. When strong dust storms happen, the wind is very strong because of the strong wind with over 8 levels, which can roll up stones and sand. As more and more dust flies into the air, dense dust covers the sky, covering the sun, making people can't see anything for a period of time, just like at night. When blowing the black wind, the air near the ground is very unstable, and the heated air below rises, and the surrounding air flows to supplement it, which has caused the air to carry a large amount of sand and dust to roll up and down, forming countless sand and dust groups with different sizes to cross and soar in the air. The upper layer of the sand wall is often yellow to red, the middle layer is gray and black, and the lower layer is black. The yellow and redness in the upper layer is due to the thin dust and fine particles in the upper layer, and the sunlight can almost penetrate through the dust and shoot down. But the lower dust concentration is large, the particles are coarse, and almost all the sunlight is absorbed or scattered by the dust, so it is black. When the wind-sand wall moves across the land, the sky is bright and dark, and it is constantly changing. This is caused by the light passing through dust belts with different thickness and thickness and different thickness. Sand dust evenly floating in the air, make the horizontal visibility less than 10 kilometers of the weather phenomenon The wind blows the dust off the ground, making the air rather cloudy, with horizontal visibility within 1 km to 10 km. Strong winds blow the ground up, making the air cloudy and visibility less than a kilometer away. The wind blows the dust off the ground, obscuring the air, clouding it, and visibility below 500 meters. Drylands around North Africa and the Arabian peninsula are the main terrestrial sources of airborne dust. Also with some contributions from Iran, Pakistan and India into the Arabian Sea, and China’s significant storms deposit dust in the Pacifica . It has been argued that recently, poor management of the Earth's drylands, such as neglecting the fallow system, are increasing dust storms size and frequency from desert margins and changing both the local and global climate, and also impacting local economies. In the sandstorm, sandstones and dust are everywhere, which makes the air cloudy and acrid How to control dust storms ? Experiments have shown that it takes more than 2,000 years to scrape off 18 centimeters of topsoil in the grass. On the cultivated land, the same amount of topsoil would take 49 years, while it only takes 18 years on bare land. There are some measures: How to control dust storms ?

沙尘暴英语ppt:这是沙尘暴英语ppt,包括了沙尘暴的形成,沙源,不稳定的空气,沙尘暴的外观特征,世界多发区,沙尘暴的发源地,沙尘暴的危害,预防沙尘暴等内容,欢迎点击下载。

战胜沙尘暴ppt:这是战胜沙尘暴ppt,包括了沙尘暴的形成,沙源,不稳定的空气,沙尘暴的外观特征,沙尘暴的外观特征,沙尘暴的外观特点,中国多发地区,世界多发区,沙尘暴的危害,预防沙尘暴等内容,欢迎点击下载。

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