Why does warm air rise at a front? !

The lighter warmer air mass begins to rise above the other cooler denser air mass. ... Warm fronts occur when light, warm air meets cold air. The warm air rises gradually over the cold air as they meet. As the warm air rises it cools and condenses to form clouds.

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The lighter warmer air mass begins to rise above the other cooler denser air mass. ... Warm fronts occur when light, warm air meets cold air. The warm air rises gradually over the cold air as they meet. As the warm air rises it cools and condenses to form clouds.  

therefore it rises because the warmer air is lighter than the cold air

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answer; i believe the correct answer is (replication is not conservative);

the most common type of reef is the fringing reef. this type of reef grows seaward directly from the shore. they form borders along the shoreline and surrounding islands.