How do Clouds Stay up in The Sky?

Not all clouds are up in the sky. Some are on the ground! What we call fog is simply a could that is next to the ground. All air has some moisture in the form of water vapour in it. When warm, moist air cools, it often can no longer hold its moisture changes (condenses) into small drops of water which can bee seen.

So a cloud is a collection of moisture in the air. The air currents keep the cloud up in the sky. But if the cooling continues, more and more vapour is changed into drops. Gradually, the tiny droplets become larger and larger as they can no longer be held up by the air currents, they fall to the ground as rain.

Clouds can form at many different height above the earth. In fact, clouds are divided into types according to their distance from the earth. The four main families of clouds are high clouds, middle clouds, low clouds and clouds which may extend through all levels. 

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