What was the name given to the trade system where finished manufactured goods were sent to africa in exchange for slaves who were sent to the americas and exchanged for colonial goods that would finally be returned tothe home country?

How were the okanogan highlands formed? a. by subduction, which caused huge folds in earths surface b. as a result of retreating glaciers carving great valleys into the earth c. when molten rock from under the earth approached the surface d. when the collision of volcanic island chains and ocean rocks formed new earth