Why do clouds need to come together into large, darker masses when it rains instead of the individual water droplets just randomly falling on their own?
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Clouds do not come together. Rather the process which drives the condensation pushes them to expand. Rain is caused by excessive condensation which in turn is caused by rising air. If it is just a little bit, you get nice white fluffy clouds. When this continues, clouds gradually turn darker because they become thicker and block the sunlight. And finally, there comes the rain.
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