What Are Clouds Made Of?

Clouds can look like castles made of cotton candy, or they can be thin and wispy. But have you ever wondered what clouds actually are?

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SOURCES:
http://scied.ucar.edu/shortcontent/ho...
http://education.nationalgeographic.c...
https://www.nasa.gov/audience/forstud...
http://www.srh.noaa.gov/jetstream/clo...