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When talking about desert, we often associate it with the image of barren scenes and sand storm, with nothing useful. It is also often mixed with another word "desertification". Actually, things often have two sides. Only when we have a proper understanding of them, can we avoid the disadvantages and absorb good ones thus making a benefit to mankind.
Where can desert settle
Desert, generally refers to barren areas the surface of which is fully or partially covered by quicksand, with rare plants and air dry. Four out of five continents inhabited by people on the earth, have deserts distributed. Affected by climate, desert concentratedly distributed between 15 ° to 35 °in the south and north latitude. The deserts in Southern Hemisphere start from Kalahari, Namib Desert of the Atlantic coast, across the Indian Ocean, go through the Australian desert, across the Pacific to the Atacama desert in South America； while the deserts in the Northern Hemisphere began from the Sahara desert of Atlantic coast, cross the Suez Canal, the Red Sea, through the Arabian desert, then Thar desert extending in Iran, Afghanistan and India, across the Pacific, to the southwest of North America. Deserts in our country and Central Asia, due to the impact of the Tibetan Plateau uplift, are moved northward, between north latitude 35 ° ～ 50 °.
Desert’s contribution
In people"s old concept, sand storm is a serious natural disaster, with a strong destructive effect. It often results in poor soils and increases desertification； farmland, houses and roads are buried and facilities are destroyed； it will cause air pollution and the illness and death of human and animals...... However, the same sand storm also contributes for the human thrive.
Fertile ground created by wind
Long before the emergence of human civilization on Earth, the wind carried sand tirelessly thus creating on land fertile soil suitable for plant growth. China"s Loess Plateau was created by sand piled of the northwestern deserts and Central Asian inland deserts as well as Gobi deserts for 250 million years in the Northern Hemisphere, which then has become the cradle of Chinese civilization.
Dust in the wind is rich in nutrients required for plant growth. From March 20 to 22 in 2002, a large sand storm swept through Beijing and brought the soil a lot of natural and effective physical and chemical fertilizer to enrich the soil with nitrogen, phosphorus, potassium, calcium, magnesium, boron and other elements for plant growth, and hence improving the increasingly degraded soil.
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