Supercontinents[ edit ] Aside from the conventionally known continents, the scope and meaning of the term continent varies. Supercontinentslargely in evidence earlier in the geological record, are landmasses that comprise more than one craton or continental core.
The most notable examples are the Indian subcontinent and the Arabian Peninsula. Greenlandon the North American Plateis sometimes referred to as a subcontinent. Where America is viewed as a single continent, it is divided into two subcontinents North America and South America    or various regions.
Notable examples are Zealandiaemerging from the sea primarily in New Zealand and New Caledoniaand the almost completely submerged Kerguelen continent in the southern Indian Ocean. Some islands lie on sections of continental crust that have rifted and drifted apart from a main continental landmass.
While not considered continents because of their relatively small size, they may be considered microcontinents. Madagascarthe largest example, is usually considered part of Africa but has been referred to as "the eighth continent".
Division into three parts eventually came to predominate. Herodotus  in the fifth century BC, however, objected to the unity of Egypt being split into Asia and Africa "Libya" and took the boundary to lie along the western border of Egypt, regarding Egypt as part of Asia.
He also questioned the division into three of what is really a single landmass,  a debate that continues nearly two and a half millennia later. Eratosthenesin the third century BC, noted that some geographers divided the continents by rivers the Nile and the Donthus considering them "islands".
Others divided the continents by isthmusescalling the continents "peninsulas". These latter geographers set the border between Europe and Asia at the isthmus between the Black Sea and the Caspian Seaand the border between Asia and Africa at the isthmus between the Red Sea and the mouth of Lake Bardawil on the Mediterranean Sea.
In the Middle Ages the world was portrayed on T and O mapswith the T representing the waters dividing the three continents.
By the middle of the eighteenth century, "the fashion of dividing Asia and Africa at the Nile, or at the Great Catabathmus [the boundary between Egypt and Libya ] farther west, had even then scarcely passed away". But despite four voyages to the Americas, Columbus never believed he had reached a new continent — he always thought it was part of Asia.
On reaching the coast of Brazilthey sailed a long way south along the coast of South Americaconfirming that this was a land of continental proportions and that it extended much further south than Asia was known to.
Maps of this time though still showed North America connected to Asia and showed South America as a separate land. A small inset map above the main map explicitly showed for the first time the Americas being east of Asia and separated from Asia by an ocean, as opposed to just placing the Americas on the left end of the map and Asia on the right end.
Thus Europe, Asia, and Africa is one great continent, as America is another. Overall though the fourfold division prevailed well into the 19th century. By the late 18th century some geographers considered it a continent in its own right, making it the sixth or fifth for those still taking America as a single continent.
With the addition of Antarctica, this made the seven-continent model. However, this division of America never appealed to Latin Americawhich saw itself spanning an America that was a single landmass, and there the conception of six continents remains, as it does in scattered other countries.
However, in recent years, there has been a push for Europe and Asia—traditionally considered two continents—to be considered one single continent, dubbed " Eurasia " - consistent with modern understanding of geology and plate tectonics.
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In this model, the world is divided into six continents if North America and South America are considered separate continents.The “islands of meaning” people create in their everyday lives are thus “not part of nature” (Zerubavel, ). Islands of meaning “may not exist ‘out there’ in the real world” ( ) at vetconnexx.com Rent textbook Inside Social Life: Readings in Sociological Psychology and Microsociology by Cahill, Spencer E.
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"Islands of Meaning." Pp. in Inside Social Life. Ed. Spencer E. Cahill. 5th Edition. Los Angeles: Roxbury Publishing Company, Minxing Zheng University ofMassachusetts Boston [email protected] Minxing Zheng is an undergraduate student at UMass Boston, majoring in Computer Science (BS).vetconnexx.com+of+personal+success+and.
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