Clouds themselves are, in fact, just water from the sea (or other water collections on Earth). Water on the earth evaporates (turns into gas) and goes up into the sky. There, when it is colder, the water condenses: it changes from a gas to drops of water or crystals of ice. We see these drops of water as clouds. The drops fall back down to earth as rain, and then the water evaporates again. This is called the “water cycle”.
Clouds on other planets are sometimes just collections of gases.
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