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What must occur for air masses to form fronts?
They must increase in strength.
They must collide with each other.
They must move from west to east.
They must create air-pressure differences.
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They must collide with each other.
A front is the boundary that forms where two air masses with different temperature/humidity/density meet (come together). Other choices (gaining strength, moving west→east, or pressure differences) are not required conditions.
A front is the boundary that forms where two air masses with different temperature/humidity/density meet (come together). Other choices (gaining strength, moving west→east, or pressure differences) are not required conditions.
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