HOW CLOUDS FORM
Clouds form when water vapor in the air condenses to form liquid water or ice crystals. Molecules of water vapor in the air become liquid water in the process of condensation. How does water in the atmosphere condense? Two conditions are required for condensation: cooling of the air and the presence of particles in the air. The temperature at which condensation begins is called the dew point.
THE THREE MAIN TYPES OF CLOUDS ARE CIRRUS, CUMULUS, AND STRATUS.
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All information is from Prentice Hall science Explorer Weather and Climate.