- enormous widespread exchange of plants, animals, food, human population, diseases and ideas;
-one of the most significant events in the history of world ecology, agriculture and culture between America, Asia, Europe, and Africa.
-wheat, rice, sugarcane, grapes, etc. took hold in the Americas where they transformed the landscape
- European animals, multiplying quickly in the absence of natural predators. -American food crops like corn and potatoes also spread to the eastern hemisphere.
- Atlantic world connecting four continents.