http://whyzz.com/ in an interesting service that offers parents kid-ready answers to how the world works whenever and wherever they are asked.
Like Why does it rain?
Rain comes from clouds, which are themselves made up of lots and lots of tiny droplets of water that are holding on to each other. The water making up the clouds sometimes gets heavy, especially when the clouds encounter colder air. When the cloud's water droplets get heavy enough the droplets can no longer hold on to each other and they fall to the ground as rain!
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