Sunlight heats the ground, and the ground warms the nearby air. the warm air expands and rises, while cool air rushes in to take its place.
the example below this question describes the process that generates many surface winds. surface winds are an example of in the earth's atmosphere.
a. condensation
b. radiation
c. convection
d. conduction

C. Convection.
That is the process you are describing. 

Because the earth is not round ,but it may seem round when viewed from ,our planet but true some points earth is not round was an oblate spheroid -a square that it squashed as globe however is not even a perfect oblate spheroid.in fact isaac newton's first proposed that earth was not perfectly round but it was an oblate spheroid instead.that mean a square that is squashed as its poles and swollen at the

It would be the equator