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沙塵暴的英語ppt

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沙塵暴的英語ppt

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這是沙塵暴的英語ppt下載,主要介紹了What is a sandstorm;The morphological characteristics of sandstorms;The kind of the Sand duststorm;Popular places of dust storm;The effects of sandstorms,歡迎點擊下載。

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 ?

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關于沙塵暴的ppt:這是關于沙塵暴的ppt下載,主要介紹了沙塵暴及其形成;沙塵暴的危害;我國沙塵暴發生情況;沙塵暴的預防措施;問題探究;如何評價沙塵暴,歡迎點擊下載。
沙塵暴危害英文ppt:這是沙塵暴危害英文ppt下載,主要介紹了dust storm;Strong Wind;Effects;Measures;How to survive a dust storm;Method 1 of 3: Surviving a Storm on Foot,歡迎點擊下載。
臺風-寒潮-沙塵暴上課ppt:這是臺風-寒潮-沙塵暴上課ppt,包括了臺風定義,發生領域,災害表現,臺風的時空分布,西北太平洋臺風的成因,移動路徑,防御措施,辯證看臺風,寒潮,含義,實質,我國寒潮的時空分布,影響地區,防御措施,【知識窗】寒潮的標準,沙塵暴成因,危害的表現,治理措施,時間等內容,歡迎點擊下載。
《沙塵暴的英語ppt》是由用戶huangyixuan于2019-11-14上傳,屬于英語課件PPT。

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