一、自然之谜一个秋天的中午,刘鲁正在和爸爸妈妈一起吃饭。忽然,空中乌云密布,狂风大作。小鲁看着窗外低沉沉、乌蒙蒙的天空,不无忧虑地问:“爸爸、妈妈,天会不会掉下来?”妈妈笑着说:“傻孩子,天怎么会掉下来呢?”小鲁不服气地说:“天为什么变得这么矮?”爸爸告诉小鲁:“你现在看到的这个低矮的‘天’,实际上是一种云。它是由空气中的水蒸气上升到空中遇冷凝结而成的。由于空气中的上升气流可以把它们托住,所以云 First, the natural mystery An autumn noon, Liu Lu and mom and dad are eating together. Suddenly, the clouds were cloudy and the wind was blowing. Small Lu looked out the window low, black sky, without hesitation asked: ”Mom, Mom, will not fall?“ ”Mom smiled and said: “ silly boy, how could the day fall? ? ”Xiao Lu unconsciously said:“ Why did the sky become so short? ”“ Dad told Xiao Lu: ”The low sky you now see is actually a cloud. It is By the water vapor in the air rises to condensation in the air from the condensation due to the rising air in the air can hold them, so the cloud