The base of a cumulus cloud marks the altitude at which rising air cools to the dew point.

Question

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Cumulus clouds form when warm, moist air rises and cools as it reaches higher altitudes. Eventually, the rising air cools to its dew point, which is the temperature at which the air can no longer hold all of its water vapor. This causes the water vapor to condense into visible water droplets or ice crystals, forming the cloud base. Therefore, the base of a cumulus cloud marks the altitude at which rising air cools to the dew point.

The Base of a Cumulus Cloud Marks the Altitude at Which