based on arrow movement, why is the front shown in item a different from the front shown in item b?\nwarm…

based on arrow movement, why is the front shown in item a different from the front shown in item b?\nwarm air rises above cold air in item a, while two air masses collide in item b.\ncold air mixes with warm air in item a, while two air masses barely move in item b.\nwarm air is pushed upward near cold air in item a, while a boundary forms in item b.\ntwo air masses form a boundary in item a, while warm air rises above cold air in item b.

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