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Fronts

 

 

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A front is a boundary between two air masses.  A front can occur at one of these four boundaries: 

warm
cold
occluded
stationary

Fronts are caused by warm and cool air rising and falling. Warm fronts occur where warm air is rising over a certain area and causes weather.  A cold front occurs when cold air forces warmer air up on a steep angle, and causes stormy weather.