What Are Clouds Made Of?
3. Rain
When you see certain types of clouds, you know that rain is usually not far away. Just looking up into the sky can be enough to tell you that it is time to get the laundry in. Rain occurs because, as is well known, what goes up, must come back down again. As rain accumulates in clouds in the atmosphere, the droplets will gradually grow larger until they fall back down to earth under the influence of gravity.
The technical term for this is precipitation and it is an essential part of our planets water cycle. It allows parts of the world to get water that would otherwise remain dry.
