Answer:
The air behind a cold front is colder and drier.
Step-by-step explanation:
A cold front is a boundary between a cold air mass and a warm air mass, and as the cold front moves forward, it pushes the warm air mass upwards. This causes the air behind the front to cool and the moisture in the air to condense, resulting in the formation of clouds and precipitation. As the air cools and the moisture condenses, it becomes drier than the air ahead of the front. Therefore, the air behind a cold front is typically colder and drier than the air ahead of the front.