Answer: Cold front
Explanation:
A weather front can be define as the transition zone between the air masses of different temperatures, and densities affecting the climatic condition of a region.
A cold front can be define as a type of weather front. In this the cold air mass moves from the northwest to southeast directions. The air behind the cold front is drier and colder than air ahead of it. In cold front the the warm air mass is replaced by the cold air mass. This will cause the colder weather condition in a region.
On the basis of the above explanation, a colder weather condition can be because of the cold front.
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