近年来,我国北方地区沙尘暴年均发生次数呈上升趋势,波及面也越来越广,给工农业生产带来很大损失,给人们带来诸多不便。你知道沙尘暴的起因吗? 答:沙尘暴是一种强风将大量的沙粒、尘土猛烈地卷入空中的现象。它出现时,黄沙滚滚,遮天蔽日,使天空呈现土黄色,垂直能见度很差,水平能见度小于1000米,给农 In recent years, the annual average number of dust storms in northern China has been on an upward trend, and the spread has also become more widespread, which has brought great losses to industrial and agricultural production and brought a lot of inconvenience to people. Do you know the cause of sandstorms? A: Sandstorms are a phenomenon in which strong winds force large amounts of sand and dust into the air. When it appeared, the yellow sand billowed and covered the sun, causing the sky to appear khaki, and the vertical visibility was poor. The horizontal visibility was less than 1,000 meters.