What is the boundary between cold and warm air masses

Front

Step-by-step explanation:

A front is the boundary between two air masses of different densities- 'warm' & 'cold'. There are four types of fronts;

Cold Front- The cold air mass is advancing. It replaces the warm air.

Warm Front- The warm air mass is advancing. It replaces the cold air.

Stationary Front- There is little to no advancement. Neither air mass is strong enough to replace the other.

Occluded Front- Formed during the process of cyclogenesis, when a cold front overtakes a warm front. When this occurs, the warm air is separated from the cyclone center at the Earth's surface.

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step-by-step explanation:

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