Cumulus

Different types of clouds in this shot.
Most of them are of the type Cumulus. They usually are formed during day time by the heating of the earth surface. The air rises and gets saturated, forming clouds. They are good indicators of an unstable atmosphere.
Cumulus clouds are detached cauliflower shaped clouds usually. The top of these clouds are mostly brilliant white when lit by the sun, although their base is usually relatively dark.
The lower clouds are all of this Cumulus type. The small puffy ones are Cumulus humilus and the large ones are Cumulus mediocris.
Above these clouds you can see some Cirrus fibratus (a kind of veil cloud). Cirrus clouds are always higher in the atmosphere (>18.000 ft).