They aren't. Clouds are made of water droplets or ice crystals depending on the type.The billowing shape of some clouds is produced by the expansion and upward movement of warm air that is cooled as it rises.
Thunderheads.
Cumulus clouds are generally fairly small and not very tall. These clouds typically have flat bottoms and billowing tops. They have weak updrafts and often indicate calm weather. Cumulonimbus clouds are large and usually very tall. They have strong updrafts and typically have flat bottoms and flat tops, forming an anvil shape. Cumulonimbus clouds bring thunderstorms.
It Cools as it is pushed upward.
if you look up the main characteristics of all three cloud types you'll find your answer. The answer is Cumulus Cloud
"dark billowing clouds" isn't a sentence. Dark and billowing are adjectives describing clouds, a plural noun.
Cumulus
They aren't. Clouds are made of water droplets or ice crystals depending on the type.The billowing shape of some clouds is produced by the expansion and upward movement of warm air that is cooled as it rises.
Example sentences:A plume of smoke was billowing from the campfire. (verb)The billowing clouds drifted over the horizon. (adjective)
Thunderheads.
Cumulus clouds are the extremely puffy clouds in the sky. The base of the cloud is usually flat and is topped by billowing towers of puffy white clouds resembling cauliflower heads.
Cumulonimbus. big billowing clouds that look like mushrooms.
No the word billowing is not an adverb. It is a present participle verb and a noun.
Cumulus clouds are puffy, billowing clouds rather than stratified, and can exist as well-defined within a mass of otherwise clear air. Rapid heating can cause towering cumulus clouds or may create the related forms known as cumulonimbus (thunderstorm) clouds.
Cumulus clouds are puffy, billowing clouds rather than stratified, and can exist as well-defined within a mass of otherwise clear air. Rapid heating can cause towering cumulus clouds or may create the related forms known as cumulonimbus (thunderstorm) clouds.
Cumulonimbus clouds are so big because a warm draft pushes the cloud upward.
We hoisted the flag and watched it billowing in the wind. She walked along the seashore with her long, white dress billowing in the breeze.