The pressure differences that make wind happen are caused
a. by a sudden drop in humidity.
b. when water vapor in the air rises then falls.
c. by accumulations of clouds in different areas.
d. by the unequal heating of earth’s surface.

As we know by ideal gas equations that

so here as the temperature of gas increases the density of air at that place will go down

Due to this density decrease in air the pressure also decreased

Now at some other place we will have less temperature so at that place density is high and hence pressure will be high

Now due to this temperature difference we will have density difference which will cause change in pressure

now this change in pressure will cause the wind blow from high pressure to low pressure region

so the correct answer will be

d. by the unequal heating of earth’s surface.

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