how long does a parcel of water take to complete the journey through the ocean conveyor belt on average?

What is the difference between external & internal migration

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)

Do larger countries receive more money in remittances than smaller countries