Joke Collection Website - Talk about mood - What strange phenomena are there in the desert?
What strange phenomena are there in the desert?
Deserts are generally aeolian landforms, mostly beaches and sand dunes, and there are often rocks under the sand. Moreover, the soil in the desert is very thin and there are few plants. Some deserts are salt flats and there is no vegetation at all.
Although there are few plants in the desert, there are still many varieties, such as desert willow, which is drought-resistant or salt-tolerant plants. There is little rain in the center of the desert. Deserts often get water from rivers in nearby mountains. Although these rivers carry a lot of soil, they will dry up after a day or two in the desert. But it rains occasionally in the desert, and it is often a rainstorm when it rains. At this time, usually dry rivers will be filled with water quickly, which is prone to floods. If there is enough water in the desert, seasonal lakes will form, which are generally shallow and salty. Because the bottom of the lake is very flat, the wind will blow away dozens of square kilometers, leaving a salt flat after the lake dries up.
There are several strange phenomena in the desert, and a mirage is one of them. Mirage is a natural phenomenon formed by light refraction, that is, it is illusory and actually does not exist. Mirages can be seen occasionally in the desert. It is the true embodiment of another space, which is manifested in another space in material movement. Mirages often occur after rain, because the air humidity is high at this time, thus forming a lens system.
When the temperature near the ground changes sharply in the desert, it will cause great difference in atmospheric density. At this time, when the light propagates, the distant scenery undergoes abnormal refraction and total reflection, resulting in a mirage.
Mirages can be divided into Shanghai mirage, Xiahai mirage and seaside mirage. Because the sand in the desert is very hot by the sun during the day, the air will rise rapidly when it approaches the sand layer, thus forming the phenomenon that the upper layer is cold and the lower layer is hot, and the upper layer is denser than the lower layer. The light in front of the scene will be refracted from the dense air to the less dense air, thus forming a mirage. From a distance, it looks like a reflection in the water. If a person is hot and thirsty in the desert and sees a mirage, he will mistakenly think that he has discovered an oasis, but after a gust of wind, the scene in front of him disappears again, which is just an illusion.
Although a mirage is beautiful, land desertification is caused by natural drought and man-made excessive animal husbandry. Therefore, to keep the land moist, only when the water content is greater than the dryness can desertification be reversed.
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