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Clouds are made up of tiny water droplets or ice crystals, usually a mixture of both. The water and ice scatter all light, making clouds appear white. If the clouds get thick enough or high enough all the light above does not make it through, hence the gray or dark look.
The sun is also the main contributing factor as to why clouds often, but not always, appear to be white. First, letâs talk about the composition of a cloud. Clouds are composed of tiny round water droplets, which form when water vapor condenses from a gas to a liquid. Next is the electromagnetic spectrum. The sun emits energy over a wide rangem and humans aren't able to see most of that energy with the naked eye.