What specific geographical feature traditionally divides european russia from asian russia?

In order from largest to smallest what are earths five main oceans

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

According to the theory of continental drift, what was the priginal state of the worlds continents