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Clouds cannot be contained because when a cloud comes together, or becomes more dense, it creates rain. A cloud is made of water vapor that is very spread out. Clouds are formed when water evaporates, due to hot air, and rises higher in Earth's atmosphere. When these water particles cool they begin to condense and make clouds. However, don't be confused: Clouds are not dense. In fact, planes often fly through them! Clouds are a vital part of our atmosphere. They produce water and snow, and provide shade from the Sun.