What does an annual eclipse mean?

What does the wind erosion year series mean?

Ing means in progress, serialization should mean serialization, and the author hasn't finished writing yet, so it means writing.

What is erosion in sixth grade science?

Gradual destruction or corrosion: Rock is weathered by natural erosion.

To put it simply: the process that the substances on the surface of land and beach are gradually stripped and separated under the action of external forces such as wind, waves and running water.

Look up modern Chinese dictionary:

Erosion: 1, gradually eroding to make it worse. Bacteria corrode the human body. 2. Secretly occupy (property) and erode public funds.

Who is the original author of The Year of Wind Erosion?

The authors of The Year of Wind Erosion are Cong Bu Kuaile (responsible for the epiphyseal edition) and Bu Liao Zhi (responsible for the first frost edition). The whole outline of this novel was conceived by Shi Kuaile. Two people each take one. * * * Two versions. This novel is actually an absurd story. One of the authors is me. And I, you definitely know me.

How much does the desert erode China every year?

The desertification situation in China is very serious. According to the materials published by Desertification Control Office of State Forestry Administration 1998, China is one of the countries with serious desertification in the world. According to the national survey of desert, Gobi and desertified land and the results of desertification survey, the area of desertified land in China is 2.622 million square kilometers, accounting for 27.4% of the national territory, and the population affected by desertification is nearly 400 million. According to the research of international cooperation projects in China, the United States and Canada, the direct economic loss caused by desertification in China is about 54,654.38 billion yuan+RMB.

Among the desertified land in China, the area of wind erosion and desertification caused by strong winds is the largest, accounting for 654.38+607 million square kilometers. According to statistics, since the 1970s, the desertification area alone has expanded at a rate of 2,460 square kilometers per year.

The desertification of land has created a material source for sandstorms. Therefore, sandstorms in northern China are commonly known as "black winds". Because dust storms are often opaque, they occur more and more frequently, with great intensity and wide range. 1On May 5, 1993, strong sandstorms occurred successively in Xinjiang, Gansu and Ningxia, causing 1 16 deaths or disappearances, 264 injuries, tens of thousands of livestock losses, 337,000 hectares of crops affected, and direct economic losses of 540 million yuan. 1April 1998 15-2 1 day, a strong sandstorm swept through the arid, semi-arid and semi-humid areas of China from west to east, passing through Xinjiang, Gansu, Ningxia, Shaanxi, Inner Mongolia, Hebei and western Shanxi. On April 16, the dust floating in the sky settled in Beijing, Tianjin and the north of the lower reaches of the Yangtze River, forming a large area of floating dust weather. Among them, Beijing, Jinan and other places met with the rain cloud system, so "mud rain" fell from the sky. In Yinchuan, Ningxia, because of the continuous dust, the plane was grounded and people even felt difficult to breathe.

From the 3rd century BC to 1949, there were 70 strong sandstorms recorded in * *, with an average of 3 1 year. There have been 7 1 times since the founding of the People's Republic of China 50 years ago. Although there is a great difference in standards between historical records and today's meteorological observations, it proves that there are more sandstorms than in the past, and there is no problem.

According to the analysis of Landsat image data of China 17 typical sand area, it is also proved that the desertification development situation in China is very severe. Mu Us Sandy Land is located at the junction of Inner Mongolia, Shaanxi and Ningxia, covering an area of about 40,000 square kilometers. In the past 40 years, the area of quicksand has increased by 47%, the area of woodland has decreased by 76.4%, and the area of grassland has decreased by 17%. Due to overgrazing and firewood cutting in the south of Hunshandake Sandy Land, the area of quicksand increased by 98.3% and the area of grassland decreased by 28.6% in just 9 years. In addition, Minqin Oasis in Gansu is shrinking, Populus euphratica forest and Liu Honglin in the lower reaches of Tarim River in Xinjiang are extinct, grassland degradation and Haloxylon ammodendron forest disappear in Alashan area of Gansu Province ... a series of grim facts.

The final result of land desertification is mostly desertification. Types and Distribution of Desertification in China There are four types of desertification land in China: wind erosion desertification, water erosion desertification, freeze-thaw desertification and soil salinization. China's wind erosion and desertification land covers an area of 6.5438+0.607 million square kilometers, mainly distributed in arid and semi-arid areas, which is the largest and most widely distributed among all kinds of desertification land. Among them, the arid area is about 876 thousand square kilometers, which is generally distributed in the west of Langshan Mountain in Inner Mongolia. The Tengger Desert and the north of Longshou Mountain include the Hexi Corridor, the Qaidam Basin and its north, and the west north of * * *. The semi-arid area is about 492,000 square kilometers, which is generally distributed in the east and south of Langshan Mountain in Inner Mongolia, passing through Hangjinhouqi, Chengkou County and Wuhai City, and then passing through the central and eastern Hexi Corridor to Subei Mongolian Autonomous County, showing a continuous large-scale distribution. The sub-humid arid area is about 239,000 square kilometers, mainly distributed in the east of the Mu Us Desert and the east of Inner Mongolia, east longitude 106 degrees. The total area of water erosion and desertification in China is 205,000 square kilometers, accounting for 7.8% of the total area of desertified land. It is mainly distributed in the Wuding River, Kuye River and Tuwei River basins in the northern part of the Loess Plateau, and mainly distributed in the middle and upper reaches of Xiliao River and Daling River in the northeast.

The area of freeze-thaw desertification land in China is * * * 366,000 square kilometers, accounting for 13.8% of desertification land. Freeze-thaw desertification land is mainly distributed in high altitude areas of Qinghai-Tibet Plateau. The total area of salinized land in China is 233,000 square kilometers, accounting for 89% of the total area of desertification. The areas where soil salinization is concentrated are Qaidam basin, oasis around Tarim basin and the northern foot of Tianshan Mountain. ......

Why didn't Gu Jian rust and corrode for thousands of years?

1965 During the excavation of the Chu Tomb in Hubei Province, two swords with cold light were found, both of which had beautiful black diamond plaid, and the plaid part (a short section between the hilt and the body) also had smooth patterns with green glass ornaments embedded.

It is sulfide, that is, it is formed by the interaction between sulfur or sulfur compounds and metal surfaces, and it also contains other elements. This treatment makes the sword beautiful and enhances its corrosion resistance.

What is the content of hydrochloric acid in the acidic copper-containing waste liquid produced by etching in recent years?

See how much copper clad laminate you corrode. But as long as the reacted ferric chloride solution is saturated, it will not corrode again. The copper content in the solution is related to how much ferric chloride you use. You can convert it yourself.