When air mass moves toward a warmer air mass, it causes a cold front. the air rises, leaving temperatures in the region. on a weather map, a blue line with represents the front.

When a cold air mass moves toward a warmer air mass, it causes a cold front. The warm air rises, leaving colder temperatures in the region. On a weather map, a blue line with triangles represents the front.

Please look at diagram below.

Cold front: A transition zone where cold air mass replaces the warm air mass. Cold front is represented by a blue line with triangle pointing towards the direction of movement i.e towards warmer air.

When a_cold___ air mass moves toward a warmer air mass, it causes a cold front. The _warmer___ air rises, leaving _cold___ temperatures in the region. On a weather map, a blue line with __triangle pointing towards direction of movement__ represents the front.

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the endomembrane system i think