We just learned that cumulonimbus clouds are tall mushroom shaped clouds that are sometimes seen during thunderstorms, lightning and tornadoes.
Another type of cloud is called a stratus cloud.
Stratus clouds are low in the sky, and look flat and hazy like a fog.
These clouds may cause a light drizzle of rain or snow flurries.
(from: wikipedia - stratus cloud)
Kid Facts - Blast from the past: Lava Fountain
