Mature Stage
When the cumulus cloud becomes big, the water in it
becomes heavy. It starts to fall out of the cloud. At the same
time, cool dry air starts to enter the cloud. Cool air is heavier
than warm air. The cool air creates a wind that
blows
downward. This wind pushes the heavy water to the ground. It starts
to rain.
This cloud is now called a cumulonimbus cloud. Lightning and thunder start to
occur. The cumulonimbus is now a thunderstorm.
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