What causes polar jet streams to form?
A. High-pressure systems
B. Rapid changes in wind direction
C. Air masses moving away from each other
D. Warm and cold air masses
colliding
D. Warm and cold air masses colliding
A. High-pressure systems
B. Rapid changes in wind direction
C. Air masses moving away from each other
D. Warm and cold air masses
D. Warm and cold air masses colliding