Why are cirrus clouds composed of ice crystals?

Cirrus clouds are only formed at very high altitudes (6000+ metres). At such temperatures temperatures are subzero and therefore cirrus clouds are made of ice crystals

True is ur answer : )

Ithink that the use of creativity in the sciences entails that one produce something out of nothing or from another thing. with this, i think that the he wrote down his results as four parts of the atomic theory is the manifestation of the  creativity of john dalton.