Clouds are white because of the way light from the sun interacts with the tiny water droplets and ice crystals that make up a cloud. Sunlight is made up of all the colors of the rainbow, and when it passes through a cloud, it is scattered by the water droplets and ice crystals in all directions. This scattering makes the cloud appear white, because all the colors of the rainbow are mixed together and our eyes see it as white. When clouds are very thick, they can sometimes appear gray or even black, because they are blocking out so much of the sun's light. And during sunrise or sunset, clouds can appear pink, orange, or red because the sunlight is passing through more of the Earth's atmosphere and the colors are being scattered differently.
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