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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.
Clouds can seem like a very abstract part of nature. Authors even use imagery of a mass of dark billowing clouds on the horizon to represent some unforeseen threat looming just out of human perception. In reality, the presence of clouds is a much more scientific phenomenon. There are three main varieties of clouds: cirrus, cumulus and stratus. They are made when air rises because of heat, the shape of the landscape or a weather front and is cooled as it reaches higher altitudes. Cumulus clouds are made of different states of water and air. Thermals