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39.9 x 15.7 cm ⏐ 15.7 x 6.2 in (300dpi)
QA INTERNATIONAL / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY QA INTERNATIONAL / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY
The ground heated by the Sun transmits its heat to the air above it, which creates a parcel of warm air. This parcel, lighter than the air around it, rises rapidly. As it does so, it cools until it reaches its dew point (the temperature at which the air is saturated with humidity), at an altitude called the condensation level. The humidity in the air parcel condenses and forms a cumulus cloud. This cloud is pushed by the wind and may grow as it passes over other rising air parcels.
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