An occluded front is caused by a(n)().
A、low pressure area
B、high pressure area
C、area of calm air
D、cold front overtaking a warm front
A、low pressure area
B、high pressure area
C、area of calm air
D、cold front overtaking a warm front
A、cold front becoming stationary B、warm front becoming stationary C、cold front overtaking a warm front D、warm front dissipating