Clouds are actually billions of tiny drops of floating water or ice crystals. The sun heats the water in oceans, seas, lakes and rivers. The water evaporates and rises into the air in the form of water vapor.
When the warm moist air meets the cool air, the vapor turns into drops of water again. These drops all get together and turn into clouds. When the water drops inside the clouds get too heavy, it begins to rain. If it's cold enough, the water will freeze and form crystals. Then, the water falls as sleet, hail or snow.
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