Ortelius was a Flemish geographer and cartographer who, while traveling with his contemporary Gerardus Mercator, was inspired to compile the first modern world atlas. The first edition of Theatrum orbis terrarium, issued in 1570, contained 53 maps compiled, in part, from the maps of 87 cartographers. A leading member of the 16th-century Flemish school of geography, Ortelius is thought to have been the first to posit what theory about the positioning of the continents? Discuss