Calculate the number of grams of Al in 371g of Al2O3​

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)

Unlike other andean nations, chile has a relatively small population of mestizos people of european descent indians people of asian descent

Monk's mound in cahokia is an enormous earthwork very near to the mississippi river. what do archaeologists believe it was used for?