TED KINSMAN / SCIENCE PHOTO LIBRARY TED KINSMAN / SCIENCE PHOTO LIBRARY
Timelapse footage of small cumulus clouds forming on a summer day. These clouds form when the sun heats the ground, causing warm moist air to rise. It cools as it rises, until it reaches a level where the water condenses. Although cumulus clouds can develop into rain clouds, when they are small and wider than they are tall, as here, they generally indicate fair weather.
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