Explanatory text of sandstorm

The most familiar thing to everyone is composition, especially expository writing. Expository writing is a type of article that uses explanation as the main way of expression to explain things, clarify things and give people knowledge. It explains the characteristics, essence and regularity of things by revealing concepts. How do we write this type of composition? Below is the description of the sandstorm that I compiled for you. You are welcome to read it. I hope you will like it. Explanation of sandstorm 1

The day before yesterday, when I got up, I saw something was wrong with the sky. When I came to the window, I saw an unpleasant earthy smell coming towards me, and the sky had turned into a muddy yellow. . As the wind gets stronger and stronger, the sky becomes more and more yellow, and the earthy smell becomes stronger and stronger. I feel a little rough in my mouth. Ah, this is a sandstorm. I have only seen it in books before, but this time I actually encountered it. The cars outside the window were all wearing yellow clothes, the buildings in the distance became increasingly blurred, and finally the boundary between heaven and earth was no longer visible. Pedestrians on the street were walking hard in the sandstorm.

Listen to my father say: "Sandstorms are caused by human beings destroying the environment. The greenhouse effect caused by the extensive use of oil, coal and other energy sources leads to abnormal climate. In addition, indiscriminate deforestation causes forest reduction and vegetation destruction. , a large amount of sand and dust in the desert are picked up by strong winds and blown to other places, forming sandstorms... Sandstorms are very harmful. Inhaling sand and dust for a long time will cause uncomfortable symptoms such as coughing and asthma."

If we want to avoid sandstorms, we must protect the environment, and we must take action immediately. Saving paper means protecting the forest. We can usually use paper backwards and forwards, and waste paper must be recycled. Instead of exchanging greeting cards, classmates let us protect our homes together and prevent sandstorms from coming again. Description of sandstorm 2

Haha! God is really helping me. You humans should also have a taste of my power. This is a "reward" given to you by nature. Don't blame me for being rude, hahahahahaha..."

I am your own "Masterpiece", you cut down trees indiscriminately, destroyed vegetation, and caused many disasters. It was you who destroyed the ecological balance first, and then created me, Sandstorm.

I am originally from the prairie. A breeze in the sky, racing with the deer, playing hide and seek with the flower sister, listening to the birds singing, we are like brothers and sisters, but you destroyed the ecological environment, the deer disappeared, the flower sister withered, the birds flew away, the past grassland It turned into a desert, and I was lonely, so I wanted to take revenge. After a while, the "soldiers" such as dust and sand joined me. We roared all the way, sweeping the earth and turning yellow sand wherever we went. The air is filled with flying sand and rocks, pedestrians are stopped, vehicles are stopped, construction sites are stopped, and planes are grounded. My presence can be seen in cities and rural areas. Human beings avoid me like the god of plague, hiding in their houses and not daring to come out.

< p> My "soldiers" are so brave, they are so pervasive that even if people close the doors and windows tightly, my "soldiers" can still get in.

When I came to x city, I played. After a while, I was tired from playing and ready to take a rest. As soon as I sat down, I was surprised to find that the beautiful scenery from before was here. I was stunned for a while and prepared to tell my "soldiers" the good news. We should also tell humans that if they damage the environment again next time, "Hmph...". Explanatory text of sandstorm 3

①The sandstorm that just passed over our country and Japan was filled with flying sand and yellow sand. Public opinion was boiling for a while.

② However, humans have no need or ability to prevent the occurrence of sandstorms.

③Sandstorms have existed since ancient times and have a certain periodicity. Tens of millions of years ago, the uplift of the Tibetan Plateau blocked the moist southwest monsoon from the Indian Ocean, forming a large-scale drought and desert area in Central Asia and northwest China. This area is in the westerly belt. It is the root cause of sandstorms and has nothing to do with human activities. However, excessive grazing, reclamation and deforestation during human development have indeed increased the intensity and frequency of sandstorms.

④ As a natural phenomenon, sandstorms are an integral part of the earth's natural ecosystem. They are interrelated and cause and effect with many other natural phenomena. If we eliminate sandstorms and the desert arid areas where they originate, we will also eliminate them on the earth. Various natural ecology, exterminating all species adapted to arid climate, will cause more terrible feedback and revenge on all natural systems around the world, and even cause disasters that we can hardly imagine.

⑤Sandstorms caused. The harm is obvious to everyone, but it is not harmful or unprofitable. ⑥First of all, sandstorms have shaped nearly one million square kilometers of the Loess Plateau. The people chose this place to take root and multiply. Sandstorms also cover many deserted and lifeless islands with fertile soil. From the Hawaiian Islands, the Japanese Islands to my country's Temple Island Islands, all are the beneficiaries of sandstorms. Secondly, the dust moved by sandstorms makes up for the lack of soil in some areas to a certain extent. For example, the Sahara Desert imports about 13 million tons of dust into the Amazon Basin every year due to sandstorms, which is equivalent to an increase of 190 kilograms of fertile soil per hectare in the region every year. Sandstorms can effectively mitigate acid rain.

Sand and dust are rich in alkaline cations such as calcium. These foreign and alkaline dust raised from the ground can effectively neutralize acid rain. The industry in northern my country is very developed, but acid rain rarely occurs except in a few cities. This has a lot to do with the frequent sand and dust weather in the north. Sand and dust storms also maintain the circulation and stability of the marine ecosystem. Sand and dust are rich in nutrients. About 40,010 of the nutrients in the silt of some sea areas were brought in by sandstorms, which promoted the flourishing of organisms in the sea areas.

⑦In fact, depending on the natural zone, precipitation and temperature, only what kind of vegetation can grow. This cannot be changed by humans.

⑧We have seen many man-made disasters where trees are planted on the grassland to prevent wind and sand, but the grassland turns into sand. The pitiful rainfall in arid and semi-arid areas may be able to meet the needs of grass growth, but when we artificially plant large trees, that little water is far from enough for the growth of trees. As a result, the trees relied on their root systems to absorb water from the surrounding areas and deep underground, and the surrounding grass quickly withered.

Without the green grass that reserves water for the big trees, big and small trees cannot escape the fate of death. In the end, what is left are just patches of sand and dead trees one after another.

⑨Sandstorms are a natural phenomenon. It is only the excessive grazing or farming and self-righteous artificial transformation of modern humans that have intensified their harm. (This article has been deleted)

10. Which of the following statements does not conform to the meaning of the original text is ( ) (3 points)

A. The uplift of the Tibetan Plateau blocks the humid flow from the Indian Ocean. The southwest monsoon has formed large-scale drought and desert areas in Central Asia and northwest my country.

B. If humans eliminate sandstorms and desert arid areas, they will also eliminate various natural ecology on the earth, exterminate all species, and even cause disasters that we can hardly imagine.

C. Sand and dust are rich in nutrients. Sandstorms carry nutrients into the ocean, which promotes the flourishing of marine life.

D. The reason why sandstorms are demonized is mainly because people only see the harm caused by sandstorms and ignore its positive aspects.

11. In the sentence "Excessive grazing, reclamation and deforestation in the process of human development, which has left a lot of land exposed" in paragraph ③, can "excessive" and "many" be removed? Please explain the reason. . (3 points)

12. According to the meaning of the text, talk about how we should understand sandstorms scientifically? (4 points)

10 3 B

11 3 It cannot be removed. (1 point) "Excessive" indicates the degree, indicating that human grazing and other activities have exceeded the capacity of nature; (1 point) "Many" indicates the scope, emphasizing that only part of the land is exposed, not all. (1 point) These words reflect the accuracy of expository language.

12 4 ① Sandstorm is a natural phenomenon and an integral part of the earth’s natural ecosystem. ②The root cause of sandstorms has nothing to do with human activities. ⑧Sandstorms are both harmful and beneficial. ④ Human beings have no ability and no need to stop the occurrence of sandstorms. (1 point for each point) Description of sandstorm 4

"Haha", God is really helping me! You humans should also have a taste of my power. This is a reward given to you by nature, hahaha!

I am Sandstorm, the "masterpiece" of you humans. You humans cut down trees indiscriminately, discharge industrial wastewater indiscriminately, destroy vegetation, cause soil erosion, and make the land desertified. You destroyed the ecological balance, but created me - a sandstorm.

I was originally a breeze on the grassland. I often played games with the grass, hid and seek with the flowers, listened to the birds singing, watched the deer race, and raced with the river. Nowadays, the land has become desertified, the grass has been buried under a lot of sand, the flowers have withered, and the birds have flown away. I'm in pain, I'm angry, I want revenge.

So, I started “recruiting”. Soon, sand, dust and other "warriors" joined me, and we gathered together to form an unstoppable sandstorm. We roared all the way, sweeping across the earth, filling the air with yellow sand and flying sand and rocks wherever we went. Pedestrians stopped, cars stopped, and factories closed down. From big cities to small mountain villages, even various tourist resorts have been messed up by me.

People avoided me as if they were avoiding death, hiding themselves in their homes with their doors and windows tightly closed.

I am not afraid of doing this. I sweep through the buildings. Wherever I go, the buildings collapse and people suffer heavy casualties. Even the lucky ones are left homeless.

Now, people are scared to hear about me. I immediately became mighty and majestic. Nowadays, every media news talks about me, haha! I'm famous! Gradually, I got tired of playing. Then find a place to rest.

Wow! What has changed here? The land that used to be desertified has now become green grass, leafy branches and flowers. My "brothers and sisters" all moved here and said to me, "Can you forgive humans?" I nodded. A few days later I turned into a breeze again. I am friends with trees and flowers again.

Description of Sandstorm 5

Haha, God is really helping me, you humans should also have a taste of my power! This is nature’s reward to you humans, hahaha!

I am your 'masterpiece'. You humans cut down trees indiscriminately, causing soil erosion, flooding, and destroying the ecological balance of nature... However, you created me - a sandstorm.

In the past, I was a breath of fresh air, living in a big forest and living a very peaceful life. I spent the whole day playing games with Brother Xiaocao, playing hide-and-seek with Sister Xiaohua, listening to Sister Bird singing, and watching Brother Xiaohua Deer race. I lived a carefree and extremely happy life! I still regard them as my brothers and sisters! However, everything is gone now. Brother Xiaocao slowly closed his eyes and lay on the ground. I can no longer hear his happy voice; the little flower sister swings her body, her beautiful hair (petals) gradually withers, and her joyful laughter disappears from this world forever; the little bird sisters swarm Flying away, brother Xiaolu settled down elsewhere... My good friend the big tree was also gone, only the roots stayed there, and the lush forest turned into a bare yellow land. Since then, I have hated humans very much and wanted to take revenge. So, I started to recruit troops, and the dust, silt, sand, etc. all became mine. In the end, we became the first sandstorm in the world.

We were also tired from playing, and we were going to go to a certain city to rest our legs. However, when we got there, we saw rows of young pioneers planting flowers, plants and trees. We looked at it, eh? These, these, those are... Oh, by the way, they are my brothers and sisters. The birds are singing, the flowers are fragrant, and the trees are shady. It is so beautiful! I turned my head and said to my companions: "My companions are here. I'm going to be with them. Goodbye!" I turned into a breeze again and was with my brothers and sisters again. Description of sandstorm 6

Today, Beijing experienced its second sandstorm since the beginning of spring. In the morning, I walked out of the house and went to school as usual. As soon as I went out, I saw the sky was gray, as if it was about to change. When I was finishing my second class, I accidentally looked out the window and saw nothing but a yellow patch outside the window, and I couldn't see anything clearly. I walked out of the classroom and as soon as I walked to the door of the building, I heard a strong wind blowing outside, "Woo... Wu..." roaring like a bad-tempered lion, and like a hungry tiger making strange howls.

As I walked out of the building, a strong gust of wind blew into my face with sand and dust, and it suddenly got into my collar and sleeves. I quickly wrapped my clothes tightly around my body and walked forward against the wind. Every step I took, I felt sand hitting my face, which was itchy and painful. The strong winds of level 5 and 6, mixed with sand and dust, howled, roared, and hit the earth; tall and straight trees swayed back and forth in the strong wind, and the entire tree tilted in one direction, and the thick branches creaked. The sound seemed to stop soon. Not to mention the saplings, some have been "sacrificed"; some are still breathing, they keep bowing deeply to "Grandpa Sandstorm", as if begging "Grandpa Sandstorm" not to lose his temper again Already….

The students were walking staggeringly. Some were going with the wind and were blown by the wind and had to run; those who were going against the wind were hunched over and struggling to move forward. Dust was flying on the ground, and even pebbles were swept up into the air. The sky and earth became hazy, making it difficult to open one's eyes. It's really uncomfortable to breathe in the sand from the sandstorm. I squinted my eyes, covered my mouth, and walked forward almost feeling my way. It’s really “difficult to move”! It was almost noon when the sandstorm gradually stopped. The sky was getting brighter again, but it was still gray. There are certain conditions for the occurrence of sandstorms. Sandstorms are the product of the interaction between strong winds and deserts, desertified land and loose surface sediments; wind is the driving force for sandstorms, and unobstructed loose soil is the material basis for sandstorms.

Therefore, whenever strong cold air moves southward in spring, sandstorms are likely to occur. At present, humans cannot change the external cause of seasonal changes, but we can effectively control the internal cause of surface conditions. But the problem also lies precisely in internal factors. In recent years, the population in many areas of our country has grown too fast, resources have been over-exploited and utilized, and the ecological environment has deteriorated sharply. Soil desertification and soil erosion have become increasingly serious, and have reached very serious levels in some areas, which is why sandstorms have occurred one after another. Yellow sand is advancing step by step, seriously threatening human survival. We can no longer remain indifferent. I really want to shout loudly: Please remember the warning given to us by the sandstorm, we must protect the living environment of mankind, and never cut down the sandstorm explanatory text 7

①Global warming is the direct cause of the occurrence of sandstorms Cause? Sandstorm is a weather phenomenon and disastrous weather where wind and sand interact. Human activities and desertification are the main causes of sand and dust storms. The first reason for the occurrence of sandstorms is the dry climate and strong winds; the second reason is the geographical changes caused by human activities, such as the destruction of vegetation and loose soil.

② On average, more than 180 sandstorms occur every year around the world. Sandstorms in China have increased dramatically since 1998. Affected by multiple factors, the frequency and intensity of sandstorms in China will increase in the next few years.

In the next few decades, under the influence of global warming, the precipitation in the arid and semi-arid areas of the mid-latitude inland areas of the Northern Hemisphere will not change much, but the humidity will increase significantly, surface evaporation will increase, and the soil will dry out, thus forming conditions conducive to the occurrence of sandstorms. adverse climate background. In addition, the irrational use of land resources in northwest and northern China is difficult to fundamentally reverse in the short term, the degradation and reduction of grassland resources is difficult to fundamentally change, and water shortages are becoming increasingly serious. These factors will lead to the continued activity of sandstorms.

③ Sandstorms do not occur in all windy places. Sandstorms are only likely to occur in areas with arid climate and sparse vegetation. In northwest my country, the forest coverage rate is not high, and poor northwest people still want to make a fortune by digging licorice, nostrils, and mining. These predatory behaviors have aggravated the sandstorm disaster in this area. Sandstorms are a direct consequence of desertification. The area of ??desert, Gobi and desertified land in my country has reached 1.653 million square kilometers and is developing at a rate of 2,460 square kilometers per year.

④Climate change is the decisive factor in desertification. As the climate warms, potential evaporation increases, which contributes to the formation of desertification. But the cause of desertification is not caused by climate. In fact, human factors play a decisive role in the desertification process, and desertification is the product of human irrational practices. In the history of the Northwest, the ancient Loulan Kingdom disappeared, and now there is the degrading Minqin Oasis. The large area of ??yellow sand in the northwest is waiting for the appearance of strong winds, waiting for the opportunity of the not-so-distant eastern plain.

⑤ Desertification control is an intricate project. It requires the natural and man-made factors that cause desertification in a region, as well as all social and economic aspects to be analyzed as a whole to find out the key factors affecting desertification. , in order to take appropriate measures, human beings' ability to control weather is still very limited. The key to mitigating the frequency and intensity of sandstorm disasters is to establish ecological protection laws on the ground and restore and rebuild degraded ecosystems.

1. What are the main factors in the formation of sandstorms (3 points)

2. What are the factors that lead to active sandstorms in my country? (3 points)

3 .Poor northwest people still want to make a fortune by digging licorice, lettuce, and mining. What is the description of this sentence? What role does it play in the article? (3 points)

4. Please choose an appropriate word to fill in In the blank space of paragraph ④ () (2 points)

Waiting for the opportunity in the not-so-distant eastern plain

A. Invasion

B. Invasion

C. Intrusion

D. Intrusion

5. At present, what is the most effective way for humans to control sandstorms? Please draw up a slogan to prevent sandstorms based on the content of this article. (2 points)

Answer:

1. (3 points) Climate change, human activities, desertification

2. (3 points) Adverse climate background, The utilization of land resources is unreasonable, grassland resources are degraded and reduced, and water resources are scarce.

3. (3 points) Use examples to explain specifically those areas with arid climate and sparse vegetation where sandstorms are likely to occur, and emphasize the harmfulness of this predatory behavior.

4. (2 points) A

5. (2 points) A little