What causes weather fronts to move?

A warm air mass pushes into a colder air mass (the warm front), and then another cold air mass pushes into the warm air mass (the cold front). Because cold fronts move faster, the cold front is likely to overtake the warm front. ... The warm air rises as these air masses come together.

Explanation:

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when warm air rises cold air covers the spot it was in so its a cycle warm air rises cold air fills its place

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