Which of the following describes why the net force acting on air that is blowing parallel to straight contours at constant speed is zero?
A. Coriolis and pressure gradient forces are equal and pulling in opposite directions.
B. Coriolis and pressure gradient forces are equal and pulling in identical directions.
C. Coriolis and frictional forces are equal, and pulling in identical directions.
D. Coriolis and frictional forces are equal, and pulling in opposite directions.
Answer: A
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