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Answer:

When a warm air mass moves into an area of cooler air, the boundary between the air masses is called a warm front. The warmer, less-dense air slides up over the cooler, denser air in a wide, gentle slope. As the warm air cools, its relative humidity increases, and the water vapor condenses into clouds.

Explanation:

A warm air mass is made of lighter properties and is thus stable having low pressure and warm and hot air. The cold airmass is made of denser and cooler air.

  • The warm and cold front often leads to the formation of clouds and thunderstorms.
  • The warm airmass being lighter moves over the colder air mass and hence creating rain. The cold air mass presents a zone of high pressure.

Hence the increase in precipitation is the result.

Learn more about the result of a warm air mass over a cooler  

brainly.com/question/19913458.