Does the shift in outlook and values from the old kingdom to the middle kingdom reflect a natural and unavoidable societal progression?

Which theory suggested that the earth was once a signle supercontient that gradually that broke up into the contients that we know today

Read the article titled "trans-saharan migration routes to north africa and the eu: historical roots and current trends." why do tens of thousands of sub-saharan africans try to cross the mediterranean each year? how are these refugees commonly portrayed? (site 1)

What are economic benefits of building dams