NASA
Nasa: Droplets: Kiwi Kids Cloud Identification Guide [Pdf]
Learn all about the different kinds of clouds in our atmosphere, how each forms, and specific details of each. Colored photos and an altitude cloud chart are included. PDF (requires Adobe Reader).
PBS
Pbs: Nova: Cloud Typing
Review an exhaustive photographic collection of clouds. Classify each image and select favorites among the grouping. A key illustrating each type of cloud is provided for reference.
Curated OER
Weather Dude: Clouds
Weather page highlights clouds and how they are formed. Also provides information on basic cloud types.
University of Illinois
University of Illinois Extension: Tree House Weather Kids: Clouds and Moisture: Clouds: Earth's Security Blanket
Animated resource helps young researchers understand clouds, cloud formation, and types of clouds.
Science Struck
Science Struck: Nimbus Clouds: Facts
Explains how clouds are classified and the characteristics of nimbus clouds.