A cold front forms when
A.
cold air rises and creates a vacuum.
B.
cold a...
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A cold front forms when
A.
cold air rises and creates a vacuum.
B.
cold air moves under warm air and pushes the warm air upwards.
C.
warm air collides with cold air, but neither has enough energy to move above or below the other.
D.
warm air moves in below existing cold air and pushes the cold air upwards.
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