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Monday, October 22, 2007

How are Clouds formed?

Clouds are formed when warm moist air rises into the sky. When it reaches a certain height, the warm air cools down and the water vapor in it condenses in to small drops of water, forming clouds. There are several different types of cloud. The ones which are highest are usually made up of drops of ice, and are the thinnest. These are called cirrostratus and cirrocumulus clouds. Lower clouds are called altostratus and altocumulus clouds. Lower still are the stratocumulus clouds and the nimbostratus clouds – these are the thick and shapeless rain clouds- and the lowest of all are the stratus clouds, which are seen as fog over high, mountains regions. Thunder clouds are called cumulus and cumulonimbus clouds, and these are the fat, cauliflower shaped ones.