a cold air mass meets a warm air mass. explain what will happen, in terms of the differences in their densities

If the boundary between the cold and warm air masses doesn't move, it is called a stationary front. The boundary where a cold air mass meets a cool air mass under a warm air mass is called an occluded front. ... Because cold air is denser than warm air, cold fronts are able to force warm air out more quickly.

Explanation:

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If the boundary between the cold and warm air masses doesn't move, it is called a stationary front. The boundary where a cold air mass meets a cool air mass under a warm air mass is called an occluded front. ... Because cold air is denser than warm air, cold fronts are able to force warm air out more quickly.

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there is none because earth is stationary and flat.