Beautiful sentences describing dust
1. Dust is something that everyone hates, and I am no exception, but after reading the text "If there were no dust", I found that dust is also an indispensable thing in human life.
2. So much dust wandering in the air has had a lot of influence on the change of weather. It turns out that dust is still a small engineer who makes clouds and raindrops. They will help the moisture in the air condense into clouds and raindrops. Without them, there would be no white clouds roaming in the sky, and there would be no heavy rain and light rain. Without them, in summer, strong sunlight will directly shine on the earth, so that the temperature cannot be lowered. This is the function of dust in nature.
3. Dust generally has hygroscopicity. Water vapor must be on the dust to become small water droplets, which can float in the air for a long time. Otherwise, the ground is all wet and human beings cannot survive. There is dust ...
4. If there is no dust, strong sunlight will make people unable to open their eyes, because dust absorbs part of the sun's rays and scatters them around, just like countless electric light sources. The intensity of sunlight is greatly weakened by the scattering of dust, so it becomes soft. Dust has many uses. Without dust, the sky will always be blue, and everything on the ground is wet, which will make the natural weather disappear. If there were no dust, nature would be monotonous.
5. The diameter of dust particles is generally between one millionth of a millimeter and several hundredths of a millimeter. The dust that the human eye can see is a giant in the dust, and the tiny dust can only be seen under the electron microscope. The main source of dust over land is. Industrial emissions, burning smoke and dust, soil dust, etc.
6. The air around us, from indoor to outdoor, from city to country, from flat to mountain, from desert to ocean, has its whereabouts almost everywhere. A truly dust-free space can only be created in the laboratory.
7. In a clear sky, dust is invisible. Only when the sun shines into the dark room through the' gap' in the shutters can you clearly see countless dust dancing in the air. Of course, big dust can be seen by the naked eye, and small dust is smaller than bacteria, so it can't be observed with a microscope.
8. According to the results of scientists' tests, on dry days, there are about 1, grains of dust per cubic centimeter in the air of urban streets; In the air above the ocean, there are about 1 grains of dust per cubic centimeter; In the air of wilderness and mountains, there are only a few dozen grains of dust per cubic centimeter; There is much more dust in the air of residential areas.
9. Dust is an indefatigable traveler on the earth, and it drifts with the air turbulence.
1. In the quiet air, dust began to fall at different speeds. In this way, after many days, a layer of dust was spread on the roof, doors and windows, bookshelves, desktops and floors. These dust will rise again because of the turbulence of the air, and the wind will blow them to distant places. ;