Tornadoes form when winds blowing in different directions meet in the cloud and begin to turn in circles.Warm air rising from below causes the wind tube to reach toward the ground. 當云層中不同方向的風(fēng)相遇且開(kāi)始環(huán)向旋轉時(shí)就形成龍卷風(fēng)，低空熱氣流上升致使這種風(fēng)管伸向地面。
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