Where is a pressure gradient

The pressure gradient is a force (P) that acts in a direction from higher toward lower pressure. In the atmosphere the pressure gradient force is directed perpendicular to the isobaric surfaces. It can be divided into two components, one that points vertically upward (P v ) and one that is horizontal (P H ).

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answer; seasons change because earth tilts on its axis; and the angle of the tilt causes the northern and southern hemisphere to trade places throughout the year;

answer; i believe the correct answer is (fluctuated);