There are many different kinds of clouds, and each kind has a name. Most clouds are named after their shape.
The clouds that look like great sheets pulled across the sky are called stratus clouds. These are the kinds of clouds that are closest to the ground. They form when a layer of warm air rolls over a layer of cooler air. Together they form a thick sheet-like layer.
The clouds that look like fluffy balls of cotton or scoops of ice cream are called cumulus clouds. Cumulus clouds that rise high into the air and grow dark and heavy with rain are the kinds of clouds that cause thunderstorms.
The highest clouds of all look like thin, wispy streaks or curls. They are so high up in the air, where the air is cold, that they are made of ice droplets. These clouds are called cirrus clouds.
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