Why do cities form and how have they affected culture?

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)

Chris lives in a city that experiences heavy rainfall with average annual precipitation of 882 millimeters. it is warm all year.mark lives in city with an average annual rainfall of 40 millimeters. it has hot summers and cool winters.chris's city is in a climate, while mark's city is in a climate.

Which statements describe sustainable development? multiple answer choice -fishing does not remove more fish from water systems than can be replaced by the number of fish that will be born to replace them. -sustainable development is development that is designed to improve the economic conditions in less-developed countries. -sustainable development is mainly a regional issue. -sustainable development means water is used at a rate that won't reduce the amount available for future use. - sustainable development policies only need to be concerned with environmental protection. - trees cannot be cut down faster than the number that will be replaced by new growth.