the basic types of clouds are stratus, cumulus, and cirrus. there are many other sub-types such as nimbostratus, cumulo-cirrus, cumulonimbus, altostratus, and many others.
They can form 30,000 feet above the surface or right above the ground. It just depends when rising air cools to its dew point, whereupon condensation will occur. This is called the lifting...
To cloudland and they have a cloudparty eating cloudlollies. But most evaporate again (because clouds are condensed water molecules) or become too heavy with water that it rains.
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