Clouds take different forms and appearances depending on atmospheric conditions such as temperature, humidity, and wind patterns. When a cloud becomes thick with water droplets or ice crystals, it can block out most of the light passing through it, causing the cloud to appear dark or black. This effect is particularly noticeable with cumulonimbus clouds, which are large and dense and are associated with thunderstorms and heavy rain. Additionally, the angle of the sun can create dramatic colors and shadows in the cloud, making it appear even darker.
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