NASA
Nasa: Sci Jinks: Gallery of Clouds
View images of various clouds types and read the descriptions that explain each one.
University Corporation for Atmospheric Research
Ucar: Clouds [Pdf]
Teachers and/or students are given four science experiments related to clouds in our atmosphere. Photos and brief descriptions of the main types of clouds ..Cirrocumulus, Cirrus, Altocumulus, Cumulus, Cumulonimbus, Stratus .. are included.