TELL ME WHY 01-12-2010

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By The Telegraph Online
  • Published 1.12.10

Some clouds are flat at the bottom. Only cumulus clouds have that feature. These clouds form through convection — a process where warm and air rises as it is less dense, and therefore lighter. As the warm air rises, it cools down. By the time it reaches the “dew point temperature”, it is so saturated that it starts condensing into small droplets. That is when and where the cloud is born. Since the condensation starts at the same conditions at the same altitude, the cloud grows from the same height, making the bottom almost flat.

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