Dark clouds, known as nimbus clouds, are dark because they dense and don’t let the sun shine through. Dense clouds are likely to get too heavey and release some of their condensation (water) in the form of rain. So if you see dark clouds outside it might be a good idea to take an umbrella!
Dark clouds mean that they are tall, extending way into the atmosphere. Sunlight cannot penetrate through the thick condensation and therefore creates a dark bottom. If you look at small, puffy clouds, they are often solid white or light grey on bottom. The sun’s rays can go through these easily, so they don’t appear dark.
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