自然科学知识《云是如何形成的？》How are Clouds Formed? 

朋友们，当你抬头看天空时，有没有想过那些软软白白的云朵是从哪来的呢？其实呀，云的形成就像一场神奇的魔法！地球表面的水，比如大海、河流里的水，会在太阳公公的照射下，变成我们看不见的水蒸气，偷偷跑到空气里，这就是“蒸发”。

当含有水蒸气的空气越升越高时，那里的温度越来越低，水蒸气就会紧紧抱住空气中的小颗粒，像灰尘、盐粒，慢慢变成小水滴或小冰晶，这个过程叫“凝结”。许许多多的小水滴或小冰晶聚在一起，就组成了我们能看到的云啦！

不同的云形成的条件也不太一样。有的云在高空很冷的地方形成，是冰晶组成的卷云；有的云在低空，由大量小水滴构成，比如胖乎乎的积云。

现在，你是不是对云的形成更了解啦？下次再看到云，就知道它们是怎么“变”出来的啦！

How are Clouds Formed?Friends, when you look up at the sky, have you ever wondered where those soft and white clouds come from? In fact, the formation of clouds is like a magical spell!The water on the Earth's surface, such as the water in the ocean and rivers, will turn into invisible water vapor under the sunlight of the sun and secretly escape into the air. This is called "evaporation". When the air containing water vapor rises higher and higher, the temperature there becomes lower and lower. The water vapor will then cling tightly to the tiny particles in the air, such as dust and salt grains, and gradually turn into small water droplets or ice crystals. This process is called "condensation". A large number of small water droplets or ice crystals gather together, and then form the clouds that we can see!The conditions for the formation of different clouds are also somewhat different. Some clouds are formed in very cold areas at high altitudes, and they are cirrus clouds composed of ice crystals; some clouds are at low altitudes and are made up of a large number of small water droplets, such as chubby cumulus clouds. Now, do you have a better understanding of how clouds are formed? The next time you see clouds, you'll know how they "magically appear"!

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