Why are some clouds darker than others?
"- Max and Logan Sentner  EXPLANATION:  This depends mostly on the density, or thickness, of the cloud. Clouds are made up of tiny water droplets that reflect the sunlight. As the light passes through a cloud, it reflects evenly off of all the droplets making it appear white to our eyes. As clouds build vertically and get thicker, such as a cumulonimbus cloud, less light can pass through the cloud. This will give it a darker appearance. This is also the reason why the bottom of clouds sometimes appear darker than the top. Click here to read more about how clouds form.