City A has an air pressure of 1,000 millibars. City B has an air pressure of 1,004 millibars. The distance between the two cities is 100 kilometers. The difference of 4 millibars over 100 kilometers is known as ________

A) wind
B) force
C) the pressure gradient
D) velocity
E) the Coriolis effect


Answer: C

Environmental & Atmospheric Sciences

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