<Li> Genitus and mutatus types are the same as for cumulus of little vertical extent . </Li> <P> Low cloud forms from near surface to ca . 2 kilometres (6,600 ft) and are generally composed of water droplets . </P> <P> Abbreviation: Sc </P> <P> Clouds of the genus stratocumulus are lumpy, often forming in slightly unstable air, and they can produce very light rain or drizzle . </P>

List and describe the 10 basic cloud types