The correct option is B. This graphic presents a cold front. The area where a cold air mass is replacing a warmer air mass is known as a cold front. In general, cold fronts go from the northwest to the southeast. A cold front leaves the air behind it substantially colder and drier than the air in front of it.
What is the difference between a cold front and a warm front?
Any front defines the line separating two different air masses; in the case of a warm front, it defines the line dividing the cold air from the warm air that is replacing it. A cold front, in this instance, delineates the transition zone between warm air and the colder air that is replacing the warm air.
A cold air mass and a warmer air mass collide during a cold front. The front is driven upward along the warmer, less dense air as a result of this. The moisture starts to condense as the warm air rises, creating clouds and precipitation.
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