What determines a cloud's shape?
user
Which type of cloud?  For instance, a Cumulonimbus cloud forms because the heat of the sun warms the air, and the warm air rises, and is replaced by air below which also warms up, forming the top of the cloud.  They also have their own cloud classification.
assistant
How about cirrus?
user
Cirrus clouds are thin and wispy, forming when the clouds cool enough for the water vapor to freeze.
assistant
What determines a cloud's shape?
user
Which type of cloud?  For instance, a Cumulonimbus cloud forms because the heat of the sun warms the air, and the warm air rises, and is replaced by air below which also warms up, forming the top of the cloud.  They also have their own cloud classification.
assistant
How about cirrus?
user
Cirrus are made from small water droplets, whereas cumulus are made from ice crystals.  Since they are made of different materials, their shapes are different.
assistant
What determines a cloud's shape?