I'm just taking a guess here. I don't really know. Shapes: Air patterns, and the constitution of the cloud (amount of moisture); Colors: light refracted through the moisture; Sizes: Same as shapes.
I think Faceless39 is pretty much 'bang on' with their description.
Clouds are made up of tiny droplets of moisture. Shapes probably then depend on atmospheric pressure, air, gases etc?
I am no scientific expert by any means, just speculating..
The link below talks about the different names & different looks of clouds:
http://www.activityschoolbus.com/weathe … dsfog.html
the reason is that there's a layer of air there with a different temperature or pressure (depending) that's not conducive to cloud formation. It's the same reason that very tall clouds, thunderheads for instance, have flat "anvil-shaped" tops.
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