A floodplain forms where a stream​

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)

At which boundary does subduction stop occurring, resulting in a mountain range?

Which soil layers comprise the topsoil? o horizon a horizon b horizon c horizon