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Scientist believe that earths core is around 6000°c where does this heat come from

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)

Fossils of glossopteris, an extinct fern, were discovered on which continents to support the theory of continental drift? check all that apply.