What creates the air pressure difference between the equator and the poles? A. The length of the season
B. The duration of the solar year
C. The amount of direct sunlight each area receives
D. The shape of the earth

The caste system in india was used for what purpose? a) to ensure that all people had an adequate income b) to prevent the rich from taking too much power c) to provide social control and conformity according to one’s birth d) to draft a military capable of defending india from mongol invasion